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Explorer-1
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drawing | picture |
This page contains philatelic information on the Explorer-1 satellite. Catalog numbers, years of issue, and notes on the satellites featured are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.
The remainder of the Explorer-series satellites are covered separately.
Launch information (found elsewhere) |
Reference images (found elsewhere) |
Launch covers (including anniversary-of-launch covers, and launch-related event covers) (farther below or elsewhere) |
Other postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.) (immediately below or elsewhere) |
---|---|---|---|
Explorer | Explorer | Explorer-1 | Explorer-1 |
Explorer-1 (on other than Explorer-1 launch covers) | |||
Explorer (except Explorer-1) | Explorer (except Explorer-1) |
Below is a list of Explorer-1 satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
---|---|---|---|---|
Explorer-1 | ||||
Ajman | Mi258A Mi258B | Imperforate | 1968 | "Explorer-1" |
Ajman | Mi257A-259A+Mi261A-262A fdc | One of five stamps on FDC | ||
Antigua and Barbuda | 2360b (Mi3182) | One of MS6 (2360 (a-f)) (Mi3181-3186) | 2000 | "Explorer-1" |
Batumi | Local_e Local_ie | One of local post MS6 (a-f) One of imperforate local post MS6 (a-f) | 1997 | "Explorer-1" |
Batumi | Local_e o/p1 | One of local post MS6 (a-f) overprinted in gold | 1998 | "Explorer-1" |
Batumi | Local_e o/p2 | One of local post MS6 (a-f) overprinted in silver | ||
Benin | Unknown a (Mi none) | One of MS4 (a-d) [known illegal issue] | 2012 | "Explorer-1" |
Benin | Unknown ms (Mi none) | In (lower-left) margin of MS4 (a-d) [known illegal issue] | 2017 | "Explorer-1" (also launch date) |
Benin | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 on FDC | ||
Benin | Unknown fdc | (Multi-color printed) cachet on FDC | ||
Bolivia | 651 (BL130) | In (lower) margin of imperforate SS1 | 1982 | "Explorer-1" |
Burkina Faso | 1168f (Mi1734) | One of MS6 (1168 (a-f)) (Mi1729-1734) | 2000 | "Explorer-1" |
Central African Republic | Mi13916-13921_ms6 | MS6 (Mi13916-13921) | 2023 | 65th anniv. "Explorer-1" launch |
Central African Republic | BL2870 | SS1 (Mi13922) | ||
Chad | Unknown c (Mi none) Unknown ic | One of MS4 (a-d) [known illegal issue] One of imperforate MS4 (a-d) | 2011 | "Explorer-1" |
Chad | Unknown ms fdc Unknown ims fdc | MS4 and (multi-color printed) cachet on FDC Imperforate MS4 on FDC | ||
Chad | Unknown c (Mi none) Unknown ic | One of MS4 (a-d) [known illegal issue] One of imperforate MS4 (a-d) | 2017 | "Explorer-1" [overprints of Chad 2011 set] |
Chad | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 on FDC | ||
Congo Republic | Unknown ss (BL none) | In (upper-left) margin of SS1 [known illegal issue] | 2014 | "Explorer-1" |
Congo Republic | Unknown ms (Mi none) | In (upper-center) margin of MS2 (a-b) [known illegal issue] | 2016 | "Explorer-1" |
Cuba | 2136 (Mi2212) | Stamp-on-stamp: Yugoslavia 870 (Mi1216) | 1977 | "Explorer-1" |
Djibouti | C189 (Mi379A) iC189 (Mi379B) | Imperforate | 1983 | 25th anniv. "Explorer-1" launch |
Djibouti | C189 ds | Deluxe sheet (C189) | ||
Djibouti | C188-C189 fdc | One of two stamps and (multi-color printed) cachet (design like stamp) on FDC | ||
Djibouti | C189a (BL89A) iC189a (BL89B) | On stamp of SS1 (C189) On stamp of imperforate SS1 (iC189) | ||
Djibouti | Unknown a (Mi none) Unknown ia | On one stamp and in (upper-left) margin of MS2 (a-b) [known illegal issue] On one stamp and in (upper-left) margin of imperforate MS2 (a-b) | 2013 | "Explorer-1" |
Djibouti | Unknown a (Mi none) Unknown ia | One of MS3 (a-c) [known illegal issue] One of imperforate MS3 (a-c) | 2014 | "Explorer-1" |
Djibouti | Unknown ia proof | One of imperforate MS3 proof? (or imperforate MS3 with perforated MS3 colors?) | ||
Djibouti | Unknown ms fdc Unknown ims fdc | MS3 and (brown printed) cachet on FDC Imperforate MS3 and (brown printed) cachet on FDC | ||
Djibouti | Unknown ms fdc (Mi none fdc) | (Multi-color printed) cachet on FDC [known illegal issue] | 2014 | |
Djibouti | Unknown ss fdc Unknown iss fdc | (Square and round) cachets on FDC (Square and round) cachets on imperforate-stamped FDC | ||
Djibouti | Mi6412-6415_ms4 | MS4 (Mi6412-6415) | 2023 | "66th anniv. launch Explorer-1" (in French text) |
Djibouti | Mi6412_ms4 | MS4 (4x Mi6412) | ||
Djibouti | Mi6413_ms6 | MS6 (6x Mi6413) | ||
Djibouti | Mi6414_ms4 | MS4 (4x Mi6414) | ||
Djibouti | Mi6415_ms3 | MS3 (3x Mi6415) | ||
Djibouti | BL2090 | SS1 (Mi6416) | ||
Djibouti | BL2091 | SS1 (Mi6417) | ||
Franklin Mint (USA) | None | (Silver) medallion, also reverse | 1970s | "Explorer-1" |
Germany (West) | None | (Herman Oberth Gesellschaft) cachet on cover, also back | 1965 | "Explorer-I" (Explorer-1) |
Germany (West) | None | Cinderella (poster stamp), one of MS30 cinderella | ~1966 | "Explorer-1" |
Germany | None | (Black pictorial) meter on cover | 1997 | "Jupiter[-C] 1958"; in 1958 the Jupiter-C rocket was used to launch Explorers-1, 2, 3, 4, and 5; three launches were successful, and two (Explorer-2 and 5) were failures |
Great Britain | 1375a+1377a fdc (Mi1337-1340 fdc) | Insert from FDC, also front (Benham cachet, and second cancel for 30th anniv. Gagarin's flight) | 1991 | "Explorer-1 enabled Dr. Van Allen of the USA to discover" the Van Allen radiation belts |
Great Britain | 3938-3945 booklet (Mi4532-4539 booklet) | Pane3 from Prestige Booklet (3938-3945) | 2020 | "The launch of Explorer-1, the first US satellite, took place from Cape Canaveral. The satellite carried a Geiger counter to detect radiation in space". |
Grenada Carriacou | 2126b (Mi2969) | One of MS6 (2126 (a-f)) (Mi2968-2973) | 1999 | "Explorer-1" |
Guernsey (Great Britain) | 449-452 fdc (Mi518-521 fdc) | Insert back from FDC, also insert front and FDC front | 1991 | "Explorer-1" |
Guinea Republic | Mi5271-5276_ms6 | In (left) margin of MS6 (Mi5271-5276) | 2007 | Explorer-1 launch by Jupiter-C1 rocket |
Guinea Republic | Mi5271-5276_ms6 fdc | MS6 on FDC | ||
Guinea Republic | BL1471A BL1471B | In (upper) margin of SS1 In (upper) margin of imperforate SS1 | launch of the first American artificial satellite (in French text, referring to Explorer-1) | |
Guinea Republic | BL1471A fdc | SS1 on FDC | ||
Guinea Republic | Mi17804 | One of MS6 (Mi17801-17806) | 2023 | "Explorer-1" |
Guinea-Bissau | Mi4139 | One of MS4 (Mi4139-4142) | 2009 | "Explorer-1" |
Guinea-Bissau | Mi4139-4142 fdc | MS4 on FDC | ||
Guinea-Bissau | Unknown ms (Mi?) | MS3 (a-c) | 2023 | "65th anniv. launch Explorer-1" (in Portuguese text) |
Guinea-Bissau | Unknown ss (BL?) | SS1 | ||
Guinea-Bissau | Unknown ss (BL?) | SS1 (different) | ||
Guyana | 2106b (Mi2628 gold) | One of MS25 (2106 (a-y)), 280 overprinted in gold | 1989 | "Explorer-1" (in overprinted text) |
Guyana | 2106b_specimen | One of MS25 (2106_specimen (a-y)), 280 with both gold and specimen overprints | ||
Guyana | 2107b (Mi2628) | One of MS25 (2107 (a-y)), 280 overprinted in silver (Mi2627-2651) | ||
Guyana | 2107b specimen | One of MS25 (2107 specimen (a-y)), 280 with both silver and specimen overprints | ||
Hungary | CB30b (BL59A, Mi2351IIA-2354IIA) iCB30b (BL59B, Mi2351IIB-2354IIB) | In (upper-left) margin of MS4 (CB27-CB30) In (upper-left) margin of imperforate MS4 (iCB27-iCB30) | 1967 | (poorly-depicted) Explorer-1 |
Ivory Coast | Unknown d (Mi none) Unknown id | One of MS4 (a-d) [known illegal issue] One of imperforate MS4 (a-d) | 2011 | "Explorer-1" |
Ivory Coast | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 on FDC | ||
Ivory Coast | Unknown d (Mi none) Umknown id | One of MS4 (a-d) [known illegal issue] One stamp of imperforate MS4 (a-d) | 2011 | "Explorer-1" |
Ivory Coast | Unknown ms fdc Unknown ims fdc | MS4 and (multi-color printed) cachet (same design as stamp 'd') on FDC Imperforate MS4 on FDC | ||
Ivory Coast | Unknown a-d fdc | One of four stamps on FDC | ||
Ivory Coast | Unknown a (Mi none) Unknown ia | Two of MS4 (2x (a-b)) [known illegal issue] Two of imperforate MS4 (2x (a-b)) | 2012 | "Explorer-1" |
Ivory Coast | Unknown fdc | MS4 on FDC | ||
Macedonia | 430 (Mi451) | From MS9 (430a (9x 430)) | 2008 | 50th anniv. "Explorer-1" launch |
Macedonia | 430 fdc | Stamp and (pictorial) cancel and (multi-color printed) cachet on FDC | ||
Macedonia | 430 maxi | Maxicard | ||
Malawi | Unknown ms fdc (Mi? fdc) | (Multi-color printed) cachet on FDC | 2007 | |
Maldive Islands | 2959 (Mi4687-4690) | On three of four stamps and in (right) margin of MS4 (2959 (a-d)) | 2008 | 50th anniv. "Explorer-1" launch |
Maldive Islands | 2959 fdc | MS4 on FDC | ||
Maldive Islands | 2959a-d fdc | Four stamps on FDC | ||
Mali | Unknown b (Mi?) Unknown ib | One of MS4 (a-d) One of imperforate MS4 (a-d) | 2011 | "Explorer-1" |
Mali | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 on FDC | ||
Mali | Unknown c (Mi none) | One of MS4 (a-b) [known illegal issue] | 2018 | "Explorer-1" (and launch date) |
Mali | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 and (multi-color printed) cachet (design like stamp) on FDC | ||
Manama | Mi88A Mi88B | From MS20 (20x Mi88A) Imperforate | 1968 | "Explorer-1" |
Manama | Mi87A-89A+Mi91A-92A fdc Mi87B-89B+Mi91B-92B fdc | One of five stamps on FDC One of five imperforate stamps on FDC | ||
Marshall Islands | 345c (Mi252) | One of MS25 (345 (a-y)) (Mi250-274) | 1989 | Explorer-1 launch |
Marshall Islands | KM51 | $50. (silver coin) | 1989 | "first American satellite" (Explorer-1) |
Micronesia | 81b (Mi133) | One of MS9 (81 (a-i)) (Mi132-140) | 1989 | Explorer-1 launch |
Micronesia | 344a (Mi721) | One stamp and on selvedge of MS20 (344 (a-t)) (Mi721-740) | 1999 | "Explorer-1" |
Montserrat | 849 pair (Mi906 pair) | On label/gutter of gutter-pair (2x 849), 728 overprinted in red | 1994 | "Launch of Explorer-1 - January 31, 1958 - (first U.S. satelllite)" |
Montserrat | 1200 (Mi1408-1411) | MS4 (1200 (a-d)) | 2008 | 50th anniv. "Explorer-1" launch; stamp 1200d contains a mirror image of the design in the cachet of USA 3187d fdc; a similar photograph is found in USA 3187 (USPS) "1950s" book page 17 |
Montserrat | 1200 fdc1 | MS4 and (blue printed) cachet on FDC (Plymouth cancel) | ||
Montserrat | 1200 fdc2 | MS4 and (blue printed) cachet on FDC (Brades cancel) | ||
Montserrat | 1201 (BL123) | On stamp of SS1 | ||
Montserrat | 1201 fdc | SS1 on FDC | ||
Mozambique | 1845c (Mi3260) i1845c | On one stamp and in (lower-left) margin of MS6 (1845 (a-f)) (Mi3258-3263) On one stamp and in (lower-left) margin of imperforate MS6 (i1845 (a-f)) | 2009 | "Explorer-1" |
Mozambique | 1845c_ss1 | SS1 (1845c) | ||
Mozambique | 1845 fdc i1845 fdc | MS6 on FDC Imperforate MS6 on FDC | ||
Nevis | 1545 (Mi2308-2311) | On two of four stamps and in (lower) margin of MS4 (1545 (a-d)) | 2008 | 50th anniv. "Explorer-1" launch |
Nevis | 1545 fdc | MS4 on FDC | ||
Paraguay | C405 (BL241) | On stamp and in (text in lower) margin of SS1 | 1975 | "Explorer-1" |
Paraguay | C405 fdc | SS1 on FDC | ||
Paraguay | C721 (BL451) | In (lower-left) margin of SS1 | 1988 | Model of Jupiter-C1 rocket with Explorer-1 mounted on top |
Poland | 1180 (Mi1439) | 1963 | "Explorer-1" | |
Poland | 1180+1186 fdc | One of two stamps on FDC | ||
Poland | 2248a label (Mi2539 label) | On one label of MS6 (2248a (6x 2248 + 2 labels)) | 1977 | "Explorer-1" |
Poland | 2248 cancel | (Pictorial) cancel from FDC, also front | 1977 | |
Romania | None | (Cyan typed) cachet on cover | 1992 | "the first American satellite, Explorer-1" |
Romania | 5023 (Mi6273) | Stamp and label from MS8 (5023a (8x 5023 + label)) | 2008 | 50th anniv. "Explorer-1" launch |
Romania | 5023 maxi | Maxicard | ||
Romania | 5023-5025 fdc | One of three stamps and (black printed) cachet on FDC | ||
Romania | 5024a label (Mi6274 label) | Label from MS8 (5024a (8x 5024 + label)) | ||
Romania | 5025a label (Mi6275 label) | Label from MS8 (5025a (8x 5025 + label)) | ||
Romania | None | Stamped envelope | 2008 | 50th anniv. "Explorer-1" launch |
Romania | None | Stamped envelope and illustrated address label | 2008 | 50th anniv. "Explorer-1" launch |
Romania | None | Illustrated address label on stamped envelope | 2008 | 50th anniv. "Explorer-1" launch |
Rwanda | Unknown i (Mi none) | One of MS10 (a-j) [known illegal issue] | 2010 | "Explorer-1" |
St. Thomas and Prince Islands | 1820 (BL637) i1820 | SS1 Imperforate SS1 | 2008 | 50th anniv. NASA; (50th anniv. "Explorer-1" launch) |
St. Thomas and Prince Islands | 1820 fdc i1820 fdc | SS1 on FDC Imperforate SS1 on FDC | ||
St. Vincent | 2080f (Mi2966) | One of MS9 (2080 (a-i)) (Mi2961-2969) | 1994 | "Explorer-1" |
St. Vincent | 2080 fdc | MS9 on FDC | ||
St. Vincent | 2080f specimen | One of MS9 (2080 specimen (a-i)) overprinted "specimen" | ||
St. Vincent | 2081f (Mi2975) | One of MS9 (2081 (a-i)) (Mi2970-2978) | ||
St. Vincent | 2081f specimen | One of MS9 (2081 specimen (a-i)) overprinted "specimen" | ||
St. Vincent | 2081 fdc | MS9 on FDC | ||
St. Vincent | 2702a (Mi4647) | One of MS9 (2702 (a-i)) (Mi4647-4655) | 1999 | "1958 - Explorer" (Explorer-1) |
Serbia | Mi1249 (Sc?) | like Yugoslavia 870 | 2024 | |
Tanzania | 2540 (Mi4620-4623) | MS4 (2540 (a-d)) | 2009 | "Explorer-1" |
Togo | Mi3795 | One of MS4 (Mi3794-3797) | 2011 | "Explorer-1" |
Togo | Mi3795_ss1 | On stamp of SS1 (Mi3795) | ||
Togo | BL569 fdc | (Multi-color printed) cachet on FDC | ||
Togo | Mi9194 | One of MS4 (Mi9194-9197) | 2018 | "Explorer-1" |
Togo | BL1637 | MS2 (Mi9194-9195) | ||
Togo | Unknown ms (Mi?) | MS3 (a-c) | 2023 | "65th anniv. launch Explorer-1" (in French text) |
Togo | Unknown ss (BL?) | SS1 | ||
United States | None iNone | One of cinderella strip of 2 One of imperforate cinderella strip of 2 | 1958 | Explorer-1 launch by Jupiter-C1 rocket |
United States | None iNone | One of cinderella strip of 2 on cover, also back One of imperforate cinderella strip of 2 on cover, also back | 1958 | Explorer-1 launch by Jupiter-C1 rocket |
United States | 1107 fdc (Mi727 fdc) | (Imperial) cachet on FDC | 1958 | |
United States | 1107 cover (Mi727 cover) | (Compex) cachet on cover | 1958 | |
United States | None a None ia | Two of (RRI) cinderella MS4 (2x (a-b)) Two of (RRI) cinderella imperforate MS4 (2x (a-b)) | 1958 | Explorer-1 launch |
United States | None | Postcard back | ~1958 | Jupiter-C1 launch of Explorer-1 |
United States | 1237 fdc1 (Mi850 fdc1) | (Centennial green earth) cachet on FDC (3-line cancel) | 1963 | |
United States | 1237 fdc2 (Mi850 fdc1) | (Centennial green earth) cachet on FDC (4-line cancel) | ||
United States | 1213 cover (Mi817 cover) | (Sarzin) cachet on cover | 1964 | "the first tiny 50 pound payload into space" (refers to Explorer-1, though it actually had a mass of 13.97 kg (30.8 pounds) rather than 50 pounds) |
United States | C76 fdc (Mi990 fdc) | (Centennial yellow earth) cachet on FDC | 1969 | |
United States | 1759 fdc 1710 cover | (Aeropex'77) cachet on FDC, also annotated | 1978 1977 | Explorer-1 [#1 in annotated cachet] |
United States | None | (Huntspex'78/Huntsville Philatelic Society) cachet on cover, also detail | 1978 | (20th anniv.) Explorer-1 launch (implied) |
United States | None | (Space Voyage) cachet on cover | 1983 | 25th anniv. Explorer-1 launch (25th anniv. NASA cancel) |
United States | None | (Wisconsin Rapids WI Exhibit Station) cancel on cover | 1983 | 25th anniv. Explorer-1 launch |
United States | None | (Wisconsin Rapids WI Exhibit Station) cancel and (Astro Covers) cachet on cover | 1983 | 25th anniv. Explorer-1 launch |
United States | None | Cinderella | 1983 | "Explorer-1" |
United States | 2145 fdc 2219g fdc | (Space Voyage orange and purple) cachet on dual-cancel FDC | 1985 1986 | "Explorer-1" |
United States | 2145 fdc 2219i fdc | (Space Voyage red and green) cachet on dual-cancel FDC | ||
United States | None | Huntspex Station) cancel and (blue and black printed) cachet on cover | 1988 | 30th anniv. Explorer-1 launch |
United States | None | (Huntspex Station) cancel on cover (different) | 1988 | 30th anniv. Explorer-1 launch |
United States | None | (Huntspex Station) cancel and (Huntspex'88/Huntsville Philatelic Club) cachet on cover | 1988 | 30th anniv. Explorer-1 launch |
United States | 2745 fdc (Mi2341 fdc) | (Mystic Stamp Company) back of FDC, also front | 1993 | "Large-scale space exploration began at the Cape [Cape Canaveral] when the first US satellite was launched" (Explorer-1, on 31 January 1958) |
United States | None | (Lancopex Station) cancel on cover | 1993 | 35th anniv. Explorer-1 launch |
United States | 3178a fdc (Mi2903 fdc) | (Pictorial) cancel on FDC | 1997 | |
United States | Local | Local post stamp | ~1998 | "Explorer-1" and the Van Allen radiation belts |
United States | 1918-1919 cover (Mi1487-1488 cover) | (Huntspex'98/Huntsville Philatelic Society) cachet on cover | 1998 | 40th anniv. Explorer-1 launch |
United States | 3187d (Mi3126) 3187d back | One of pane of 15 (3187 (a-o)) (BL47, Mi3123-2137), also back | 1999 | Explorer-1 launch; "The first successful US Earth satellite, Explorer-1, was launched January 31, 1958" (in text on stamp back); "the US launched its first artificial satellite in 1958" (in text in CP537F_page2); (3187d fdc17 contains a mirror image of the design in Montserrat 1200d; a similar photograph is found in USA 3187 (USPS) "1950s" book page 17 |
United States | 3187d fdc1 | Stamp on FDC (BGC cachet) | ||
United States | 3187d fdc2 | Stamp and (BGC) cachet (different) on FDC | ||
United States | 3187d fdc3 | Stamp and (BGC) cachet (different) on FDC | ||
United States | 3187d fdc4 | Stamp on FDC (black and gold printed cachet) | ||
United States | 3187d fdc5 | Stamp on FDC (Colorano silk cachet) | ||
United States | 3187d fdc6 | Stamp on FDC (Paul Calle/Chris Calle cachet) | ||
United States | 3187d fdc7 | Stamp on FDC (Collins cachet) | ||
United States | 3187d fdc8 | Stamp and (multi-color printed) cachet on FDC | ||
United States | 3187d fdc9 | Stamp and (Hobby Link) cachet on FDC | ||
United States | 3187d fdc10 | Stamp and (NF) cachet on FDC | ||
United States | 3187d fdc11 | Stamp and (Cover Craft Cachets) cachet on FDC | ||
United States | 3187d fdc12 | Stamp and (D-?) cachet on FDC | ||
United States | 3187d fdc13 | Stamp and (black and magenta and blue printed) cachet on FDC | ||
United States | 3187d fdc14 | Stamp and (Pugh Cachets) cachet on FDC | ||
United States | 3187d fdc15 | Stamp and (Bevil) cachet on FDC | ||
United States | 3187d fdc16 | Stamp and (black printed) cachet on FDC | ||
United States | 3187d fdc17 | Stamp and (Mystic Stamp Company) cachet on FDC, also back | ||
United States | 3187d fdc18 | Stamp and (PCS golden-replica) cachet on FDC, also back | ||
United States | 3187d fdc19 | Stamp and (pictorial) cancel and (Space Voyage red and pink and black) cachet on FDC | ||
United States | 3187d fdc20 | Stamp and (pictorial) cancel and (Space Voyage red and tan and green) cachet on FDC | ||
United States | 3187d fdc21 | Stamp and (ArtCraft) cachet on FDC | ||
United States | 3187d fdc22 | Stamp and (Dome) cachet on FDC | ||
United States | 3187d fdc23 | Stamp and (S&T color laser) cachet on FDC | ||
United States | 3187d fdc24 | Stamp and (Ranto/USPS bulletin) cachet on FDC, also back | ||
United States | 3187d fdc25 | Stamp and (Pyrrhus hand-painted acrylic) cachet on FDC | ||
United States | 3187d fdc26 | Stamp on FDC (SpaceCraft/Swanson cachet) | ||
United States | 3187d fdc27 | Stamp and (PCS) cachet on FDC | ||
United States | 3187d fdc28 | Stamp and (Artmaster) cachet on FDC, also back | ||
United States | 3187 fdc1 | MS15 as FDC (blank/no cachet) | ||
United States | 3187 fdc2 | MS15 on FDC (Artmaster cachet) | ||
United States | 3187a-o fdc | One of 15 stamps and (ArtCraft) cachet on FDC | ||
United States | SP1259F | (USPS) souvenir page (3187), also back | ||
United States | CP537F page1 | (USPS no.571) commemorative panel (3187), also page2 | ||
United States | 3187 book page 16 | Page 16 from (USPS) "1950s" book | Jupiter-C1 launch of Explorer-1 | |
United States | 3187 book page 17 | Page 17 from (USPS) "1950s" book (with reproduction of USA 3187d) | Explorer-1 launch; also photograph of Pickering, Van Allen and von Braun holding the Explorer-1 satellite (similar photographs are found in USA 3187 fdc17 and in Montserrat 1200d) | |
United States | 3188c fdc1 (Mi3173 fdc1) | (Space Voyage red and tan and green) cachet on FDC | 1999 | "Explorer-1" |
United States | 3188c fdc2 (Mi3173 fdc2) | (Space Voyage red and tan and black) cachet on FDC | ||
United States | 3188c fdc3 (Mi3173 fdc3) | (Space Voyage red and tan and blue) cachet on FDC | ||
United States | 3189i fdc1 (Mi3233 fdc1) | (Space Voyage red and tan and black) cachet on FDC | ||
United States | 3189i fdc2 (Mi3233 fdc2) | (Space Voyage red and tan and green) cachet on FDC | ||
United States | 3188e fdc (Mi3175 fdc) | (Space Voyage red and tan and brown) cachet on FDC | 1999 | "Explorer-One" |
United States | 3189i fdc (Mi3233 fdc) | (Space Voyage red and tan and black) cachet on FDC | 1999 | |
United States | 3190a fdc1 (Mi3243 fdc1) | (Space Voyage red and peach and purple) cachet on FDC (Mission Control Station pictorial cancel) | 2000 | |
United States | 3190a fdc2 (Mi3243 fdc2) | (Space Voyage red and peach and purple) cachet on FDC (STS-103 Station pictorial cancel) | ||
United States | 3190a fdc3 (Mi3243 fdc3) | (Space Voyage red and peach and black) cachet on FDC (Nassau Bay Branch, Houston TX cancel) | ||
United States | 3190a fdc4 (Mi3243 fdc4) | (Space Voyage red and pink and purple) cachet on FDC (STS-103 Station pictorial cancel) | ||
United States | 3191h fdc (Mi3295 fdc) | (Space Voyage red and peach and black) cachet on FDC | 2000 | |
United States | None | (Mission 57) cachet on IGY cover back, also front | 2007 | "the US finally launched Explorer-1 on the first day of February in 1958" |
United States | None | (Coverscape) cachet on cover | 2018 | "Explorer-1" |
Yugoslavia | 870 (Mi1216) | 1967 | "Explorer-1" | |
Yugoslavia | 870-875 fdc | One of six stamps on FDC (green and black printed cachet) | ||
Yugoslavia | 870-871+875 fdc | One of three stamps on FDC (cyan and blue and tan printed cachet) | ||
Yugoslavia | 870 cover1 (Mi1216 cover1) | Stamp on cover (blue and red and black printed cachet) | 1967 | "Explorer-1" |
Yugoslavia | 870 cover2 (Mi1216 cover2) | Stamp on cover (green and black printed cachet) |
1From Wikipedia: "a Jupiter-C rocket was modified by the Army Ballistic Missile Agency (ABMA) to accommodate a satellite payload; the resulting rocket [was] known as the Juno-1."
Below is a list of Explorer-1 satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).
Country | Cancel Date | Cancel Location | Type of Item | Notes on Content | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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1958-01-31: Explorer-1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Port Canaveral FL | (Sarzin) cachet on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Patrick AFB, FL | (Goldcraft) cachet on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Patrick AFB, FL | (Jim Fitzpatrick purple rubber-stamp) cachet on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Patrick AFB, FL | (Swanson red rubber-stamp) cachet on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Patrick AFB, FL | (H. Flick) cachet on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1958-01-31 | Patrick AFB, FL | (H. Flick) cachet (and signature) on cover | Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Explorer-1 (events) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1970-03-31 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover, also insert | Explorer-1 re-entry | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1970-03-31 | Houston TX | (MSCS) cachet on cover | Explorer-1 re-entry | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1970-03-31 | Colorado Springs CO | (R.E. Nichol) cachet on cover | Explorer-1 re-entry (mis-named "Explore-1" in text) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Explorer-1 (anniversaries) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1968-01-31 | Cape Canaveral FL | (Swanson blue and red rubber-stamp) cachet on cover | 10th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1968-01-31 | Patrick AFB, FL | (Swanson blue and red rubber-stamp) cachet on cover | 10th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1968-01-31 | Cape Canaveral FL | (Centennial) cachet on cover | 10th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1973-01-31 | Redstone Arsenal AL | (MoF no.3) cachet on cover, also insert and insert back | 15th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1973-01-31 | Patrick AFB, FL | (Whitney purple) cachet on cover | 15th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1973-01-31 | Cape Canaveral FL | (Whitney purple) cachet on cover | 15th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1973-01-31 | Cape Canaveral FL | (Whitney purple) cachet on (airmail) cover | 15th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Kennedy Space Center FL | (Hand-drawn and black typed) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL | (MoF no.59) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Pasadena CA | (Gold printed) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL | (Blue printed) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | WSMR, NM | (Two-part black rubber-stamp) cachet on cover | 20th anniv. Explorer-1 launch (also rocket launch cover) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Marshall Space Flight Center AL | (E&T) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Redstone Arsenal, AL | (E&T) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Kennedy Space Center FL | (blank/no) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Orlando FL, Kennedy Space Center Branch | (Black rubber-stamp) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL (hand cancel) | (Whitney blue) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL (machine cancel) | (Whitney blue) cachet on (airmail) cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL (machine cancel) | (Whitney blue) cachet (and signature) on (airmail) cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Pasadena CA | (JPL Stamp Club) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Moffett Field CA | (JPL Stamp Club and purple rubber-stamp) cachet on cover, also back | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1978-01-31 | Cape Canaveral FL | (International Stamp Collectors Society) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Yugoslavia | 1978-01-31 | Zagreb | (Pictorial) cancel and (blue printed) cachet on cover, also back | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Yugoslavia | 1978-01-31 | Zagreb | (Pictorial) cancel and (purple printed) cachet on cover | 20th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Pasadena CA | (Text) cancel and (JPL Stamp Club) cachet on cover, also insert | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Pasadena CA | (Space Voyage green and red) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Kennedy Space Center FL | (Space Voyage blue and red) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Space Voyage purple and red) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (blue and black printed) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (KSC Philatelic Society) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and cinderella on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (FMF Local Post) cachet (different) on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Titusville-Moonport Stamp Club) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and cinderella and (black printed) cachet on card | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL (hand cancel) | (Pictorial) cancel and (Whitney magenta) cachet on (airmail) cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL (machine cancel) | (Whitney magenta) cachet on (airmail) cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Redstone Arsenal GA | (FMF Local Post) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Redstone Arsenal GA | (FMF Local Post) cachet (slightly different) on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Houston TX | (SCCS) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (blue printed) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1983-01-31 | Cape Canaveral FL | (Pictorial) cancel and (red typed) cachet on cover | 25th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States Russia (USSR) | 1983-01-31 1982-10-04 | Cape Canaveral FL Kosmodrome Baikonur | (Pictorial) cancel and (blue rubber-stamp) cachet on cover | 25th anniv. Explorer-1 launch 25th anniv. Sputnik-1 launch |
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United States Russia (USSR) | 1988-01-31 1987-10-04 | Cape Canaveral FL Kosmodrome Baikonur | (Green rubber-stamp) cachet on cover | 30th anniv. Explorer-1 launch 30th anniv. Sputnik-1 launch |
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United States | 1988-01-31 | Cape Canaveral FL | (Space Medal Cover) cachet (and medallion) on cover, also back and (Briefmarkenhaus Göde) insert and information card | 30th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1998-01-31 | Cape Canaveral FL | (Pictorial) cancel on postal card | 40th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1998-01-31 | Cape Canaveral FL | (Pictorial) cancel and (B&D) cachet on cover | 40th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1998-01-31 | Cape Canaveral FL | Local post stamp and (pictorial) cancel and (blue and black printed) cachet on cover | 40th anniv. Explorer-1 launch; also IGY | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 1998-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Ranski) cachet on cover | 40th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Austria | 2008-01-31 | Vienna | (Multi-color printed) cachet on cover | 50th anniv. Explorer-1 launch; photo is the same as that on Montserrat 1200d, (horizontally-flipped) on the cachet of USA 3187d fdc; a similar photograph is found in USA 3187 (USPS) "1950s" book page 17 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Spain | 2008-01-31 | Madrid | (Pictorial) cancel and (black printed) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (black printed) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (black printed) cachet (same) and second (multi-color printed) cachet on cover, also (sticker) cachet on back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Washington DC | (Mission 57) cachet on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Mission 57) cachet on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Marshall Space Flight Center AL | (Pictorial) cancel and (Mission 57) cachet (different) on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Mission 57) cachet on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Mission 57) cachet (different) on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (Mission 57) cachet (different) on cover, also back | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Pasadena CA | (Personalized) stamp (design similar to USA 3187d and (pictorial) cancel and (Therome Cachets) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Pasadena CA | (Personalized) stamp and (pictorial) cancel and (Therome Cachets) cachet (different) on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel and (black printed) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Cape Canaveral FL | (Pictorial) cancel on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Pasadena CA | (Pictorial) cancel and (JPL Stamp Club) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2008-01-31 | Pasadena CA | (Personalized) stamp and (pictorial) cancel and (black and red and orange printed) cachet on cover | 50th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
United States | 2013-01-31 | Bourne Station MA | (Coverscape) cachet on cover | 55th anniv. Explorer-1 launch | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Explorer-1 (on other than Explorer-1 launch covers) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
There exist a large number of covers with a Sokalsky cachet depicting 19 rockets, one of which is the Jupiter-C1 launch rocket with Explorer-1 mounted on top (compare with USA postcard 1958). Details about the cachet, as well as images of the covers, are found in the Sokalsky page. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
There exist a large number of Centennial Covers with generic cachets with multiple satellites depicted. One of those cachets includes Explorer-1. Details about the cachets, as well as images of the covers, are found in the Centennial Covers page.
Austria | 1967-10-04 | Gmünd | (Cyan printed) cachet on Sputnik-1 anniversary cover | "Explorer I (USA) [was] launched 1.2.1958 [and] discovered the van Allen radiation belt" (in German text) |
United States | 1975-02-14 | Kennedy Space Center FL | (MoF no.24) insert from Pegasus-1 anniversary cover, also cover front | "Explorer-1" |
United States | 1998-03-10 | 1996-12-04 Pasadena CA | Kennedy Space Center FL (Pictorial) cancel on Mars Pathfinder cover | Explorer-1 |
United States | 1998-04-26 | Pasadena CA | (Pictorial) cancel on Cassini-Huygens event cover | Explorer-1 |
United States | 1999-06-19 | Pasadena CA | (Pictorial) cancel on QuikScat launch cover | Explorer-1 |
United States | 1999-06-24 | Pasadena CA | (Pictorial) cancel on Cassini-Huygens event cover | Explorer-1 |
United States | 1999-08-17 | Pasadena CA | (Pictorial) cancel on Cassini-Huygens event cover | Explorer-1 |
United States | 1999-09-23 | Pasadena CA | (Pictorial) cancel on MCO event cover (JPL Stamp Club cachet) | Explorer-1 |
United States | 1999-09-23 | Pasadena CA | (Pictorial) cancel on MCO event cover (black and purple rubber-stamp cachet)
| United States | 1999-12-18 | Pasadena CA | (Pictorial) cancel on EOS-Terra launch cover | Explorer-1 |
United States | 1999-12-20 | Pasadena CA | (Pictorial) cancel on ACRIMSAT launch cover | Explorer-1 |
United States | 2000-10-06 | Pasadena CA | (Pictorial) cancel on Ulysses anniversary cover | Explorer-1 |
United States | 2000-12-30 | Pasadena CA | (Pictorial) cancel on Cassini-Huygens event cover | Explorer-1 |
United States | 2001-08-08 | Pasadena CA | (Pictorial) cancel on Genesis launch cover | Explorer-1 |
United States | 2001-11-26 | 2002-01-05 Pasadena CA (pictorial cancel) | Pasadena CA (text cancel) (Pictorial) cancel on Cassini-Huygens event cover | Explorer-1 |
United States | 2001-12-07 | Pasadena CA | (Pictorial) cancel on Jason-1 and TIMED launch cover | Explorer-1 |
United States | 2011-03-04 | Vandenberg AFB, CA | (Mission 57) back of Glory launch cover, also front | "The flight commemorates the 50th anniversary of Explorer-1" |
United States | 2012-08-30 | Cape Canaveral FL | (Mission 57) back of RBSP launch cover, also front | "Van Allen radiation belts, discovered by the very first American satellite in 1958" (Explorer-1) |
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1From Wikipedia: "a Jupiter-C rocket was modified by the Army Ballistic Missile Agency (ABMA) to accommodate a satellite payload; the resulting rocket [was] known as the Juno-1."
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