Explorer-1

Explorer-1
satellite
(first US satellite)

Explorer-1
drawingpicture

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)
Other postal items
(stamps, souvenir sheets, aerogrammes, postal cards, etc.)
(immediately below)
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.).

CountryCatalog NumberType of ItemYear of IssueNotes on Content
Explorer-1
AjmanMi258A
Mi258B

Imperforate
1968"Explorer-1"
AjmanMi257A-259A+Mi261A-262A fdcOne of five stamps on FDC
Antigua and Barbuda2360b (Mi3182)One of MS6 (2360 (a-f)) (Mi3181-3186)2000"Explorer-1"
BatumiLocal_e
Local_ie
One of local post MS6 (a-f)
One of imperforate local post MS6 (a-f)
1997"Explorer-1"
BatumiLocal_e o/p1One of local post MS6 (a-f) overprinted in gold1998"Explorer-1"
BatumiLocal_e o/p2One of local post MS6 (a-f) overprinted in silver
BeninUnknown a (Mi?)One of MS4 (a-d)2012"Explorer-1"
Bolivia651 (BL130)In (lower) margin of imperforate SS11982"Explorer-1"
Burkina Faso1168f (Mi1734)One of MS6 (1168 (a-f)) (Mi1729-1734)2000"Explorer-1"
ChadUnknown c (Mi?)
Unknown ic
One of MS4 (a-d)
One of imperforate MS4 (a-d)
2011"Explorer-1"
ChadUnknown fdc
Unknown ifdc
MS4 and cachet on FDC
Imperforate MS4 on FDC
Congo RepublicUnknown ss (BL?)In (upper-left) margin of SS12014"Explorer-1"
Cuba2136 (Mi2212)Stamp-on-stamp: Yugoslavia 870 (Mi1216)1977"Explorer-1"
DjiboutiC189 (Mi379A)
iC189 (Mi379B)

Imperforate
198325th anniv. "Explorer-1" launch
DjiboutiC189 dsDeluxe sheet (C189)
DjiboutiC188-C189 fdcOne of two stamps and cachet on FDC
DjiboutiC189a (BL89A)
iC189a (BL89B)
On stamp of SS1 (C189)
On stamp of imperforate SS1 (iC189)
DjiboutiUnknown a (Mi?)
Unknown ia
On one stamp and in (upper-left) margin of MS2 (a-b)
On one stamp and in (upper-left) margin of imperforate MS2 (a-b)
2013"Explorer-1"
DjiboutiUnknown a (Mi?)
Unknown ia
One of MS3 (a-c)
One of imperforate MS3 (a-c)
2014"Explorer-1"
DjiboutiUnknown ia proofOne of imperforate MS3 proof? (or imperforate MS3 with perforated MS3 colors?)
DjiboutiUnknown fdc
Unknown ifdc
MS3 and cachet on FDC
Imperforate MS3 and cachet on FDC
DjiboutiUnknown ms fdc (Mi? fdc)Cachet on FDC2014
DjiboutiUnknown ss fdc(Square and round) cachets on FDC
Franklin Mint (USA)None(Silver) medallion, also reverse1970s"Explorer-1"
Germany (West)NoneCinderella (poster stamp), one of MS30 cinderella~1966"Explorer-1"
Guinea RepublicMi5271-5276_ms6In (left) margin of MS6 (Mi5271-5276)2007Explorer-1 launch by Jupiter rocket
Guinea RepublicMi5271-5276_ms6 fdcMS6 on FDC
Guinea RepublicBL1473A
BL1473B
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 RepublicBL1473A fdcSS1 on FDC
Grenada Carriacou2126b (Mi2969)One of MS6 (2126 (a-f)) (Mi2968-2973)1999"Explorer-1"
Guernsey (Great Britain)449-451 fdc (Mi518-521 fdc)Insert back from FDC, also insert front and front1991"Explorer-1"
Guinea-BissauMi4139One of MS4 (Mi4139-4142)2009"Explorer-1"
Guinea-BissauMi4139-4142 fdcMS4 on FDC
Guyana2106b (Mi2628 gold)One of MS25 (2106 (a-y)), 280 overprinted in gold1989"Explorer-1" (in overprinted text)
Guyana2106b_specimenOne of MS25 (2106_specimen (a-y)), 280 with both gold and specimen overprints
Guyana2107b (Mi2628)One of MS25 (2107 (a-y)), 280 overprinted in silver (Mi2627-2651)
Guyana2107b specimenOne of MS25 (2107 specimen (a-y)), 280 with both silver and specimen overprints
HungaryCB30b (BL59)
iCB30b
In (upper-left) margin of MS4 (CB27-CB30)
In (upper-left) margin of imperforate MS4 (iCB27-iCB30)
1967(poorly-depicted) Explorer-1
Ivory CoastUnknown d (Mi?)
Unknown id
One of MS4 (a-d)
One of imperforate MS4 (a-d)
2011"Explorer-1"
Ivory CoastUnknown fdc
Unknown ifdc
MS4 on FDC
Imperforate MS4 on FDC
Ivory CoastUnknown a (Mi?)
Unknown ia
Two of MS4 (2x (a-b))
Two of imperforate MS4 (2x (a-b))
2012"Explorer-1"
Ivory CoastUnknown fdcMS4 on FDC
Macedonia430 (Mi451)From MS9 (430a (9x 430))200850th anniv. "Explorer-1" launch
Macedonia430 fdcStamp and cancel and cachet on FDC
Macedonia430 maxiMaxicard
MalawiUnknown ms fdc (BL unlisted fdc)Cachet on FDC2007
Maldive Islands2959 (Mi4687-4690)On three of four stamps and in (right) margin of MS4 (2959 (a-d))200850th anniv. "Explorer-1" launch
Maldive Islands2959 fdcMS4 on FDC
Maldive Islands2959a-d fdcFour stamps on FDC
MaliUnknown b (Mi?)
Unknown ib
One of MS4 (a-d)
One of imperforate MS4 (a-d)
2011"Explorer-1"
MaliUnknown fdc
Unknown ifdc
MS4 on FDC
Imperforate MS4 on FDC
ManamaMi88A
Mi88B
From MS20 (20x Mi88A)
Imperforate
1968"Explorer-1"
ManamaMi87A-89A+Mi91A-92A fdc
Mi87B-89B+Mi91B-92B fdc
One of five stamps on FDC
One of five imperforate stamps on FDC
Marshall Islands345c (Mi252)One of MS25 (345 (a-y)) (Mi250-274)1989Explorer-1 launch
Marshall IslandsKM51$50. (silver coin)1989
Micronesia81b (Mi133)One of MS9 (81 (a-i)) (Mi132-140)1989Explorer-1 launch
Micronesia344a (Mi721)One and on selvedge of MS20 (344 (a-t)) (Mi721-740)1999"Explorer-1"
Montserrat1200 (Mi1408-1411)MS4 (1200 (a-d))200850th 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
Montserrat1200 fdc1MS4 and cachet on FDC
Montserrat1200 fdc2MS4 and cachet (same) on FDC (different cancel)
Montserrat1201 (BL123)On stamp of SS1
Montserrat1201 fdcSS1 on FDC
Mozambique1845c (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
Mozambique1845 fdc
i1845 fdc
MS6 on FDC
Imperforate MS6 on FDC
Nevis1545 (Mi2308-2311)On two of four stamps and in (lower) margin of MS4 (1545 (a-d))200850th anniv. "Explorer-1" launch
Nevis1545 fdcMS4 on FDC
ParaguayC405 (BL241)On stamp and in (text in lower) margin of SS11975"Explorer-1"
ParaguayC405 fdcSS1 on FDC
Poland1180 (Mi1439)1963"Explorer-1"
Poland1180+1186 fdcOne of two stamps on FDC
Poland2248a label (Mi2539)On one label of MS6 (2248a (6x 2248 + 2 labels))1977"Explorer-1"
Poland2248 cancelCancel on FDC, also front1977
Romania5023 (Mi6273)Stamp and label from MS8 (5023a (8x 5023 + label))200850th anniv. "Explorer-1" launch
Romania5023 maxiMaxicard
Romania5023-5025 fdcOne of three stamps and cachet on FDC
Romania5024a label (Mi6274 label)Label from MS8 (5024a (8x 5024 + label))
Romania5025a label (Mi6275 label)Label from MS8 (5025a (8x 5025 + label))
RomaniaNoneStamped envelope200850th anniv. "Explorer-1" launch
RomaniaNoneStamped envelope and illustrated address label200850th anniv. "Explorer-1" launch
RomaniaNoneIllustrated address label on stamped envelope200850th anniv. "Explorer-1" launch
RwandaUnknown i (Mi?)One of MS10 (a-j)2010"Explorer-1"
St. Thomas and Prince Islands1820 (BL637A)
i1820 (BL637B)
SS1
Imperforate SS1
200850th anniv. NASA; (50th anniv. "Explorer-1" launch)
St. Thomas and Prince Islands1820 fdc
i1820 fdc
SS1 on FDC
Imperforate SS1 on FDC
St. Vincent2080f (Mi2966)One of MS9 (2080 (a-i)) (Mi2961-2969)1994"Explorer-1"
St. Vincent2080f specimenOne of MS9 (2080 specimen (a-i)) overprinted "specimen"
St. Vincent2081f (Mi2975)One of MS9 (2081 (a-i)) (Mi2970-2978)
St. Vincent2081f specimenOne of MS9 (2081 specimen (a-i)) overprinted "specimen"
St. Vincent2702a (Mi4647)One of MS9 (2702 (a-i)) (Mi4647-4655)1999"1958 - Explorer" (Explorer-1)
Tanzania2540 (Mi4620-4623)MS4 (2540 (a-d))2009
TogoMi3795One of MS4 (Mi3794-3797)2011
TogoBL569 fdcCachet on FDC
United States1107 fdc (Mi727 fdc)(Imperial) cachet on FDC1958
United StatesNone a
None ia
Two of (RRI) cinderella MS4 (2x (a-b))
Two of (RRI) cinderella imperforate MS4 (2x (a-b))
1958Explorer-1 launch
United StatesNonePostcard back~1958Jupiter-C launch of Explorer-1
United StatesC76 fdc (Mi990 fdc)(Centennial yellow earth) cachet on FDC1969
United StatesNone(Huntspex '78/Huntsville Philatelic Society) cachet on cover, also detail1978(20th anniv.) Explorer-1 launch (implied)
United StatesNone(Space Voyage) cachet on cover198325th anniv. Explorer-1 launch (25th anniv. NASA cancel)
United StatesNone(Wisconsin Rapids WI Exhibit Station) cancel on cover198325th anniv. Explorer-1 launch
United StatesNone(Wisconsin Rapids WI Exhibit Station) cancel (same) and (Astro Covers) cachet on cover198325th anniv. Explorer-1 launch
United StatesNoneCinderella1983"Explorer-1"
United States2145 fdc+2219i fdc (Mi? fdc)(Space Voyage) cachet on dual-cancel FDC1985/1986"Explorer-1"
United StatesNoneHuntspex Station) cancel and (printed) cachet on cover198830th anniv. Explorer-1 launch
United StatesNone(Huntspex Station) cancel (same) on cover (different)198830th anniv. Explorer-1 launch
United StatesNone(Huntspex Station) cancel (same) and (Huntspex '88/Huntsville Philatelic Club) cachet on cover198830th anniv. Explorer-1 launch
United StatesNone(Lancopex Station) cancel on cover199335th anniv. Explorer-1 launch
United StatesLocalLocal post stamp~1998"Explorer-1" and the Van Allen radiation belts
United States1918-1919 cover (Mi1487-1488 cover)(Huntspex '98/Huntsville Philatelic Society) cachet on cover199840th anniv. Explorer-1 launch
United States3187d (Mi3126)
3187d back
One of pane of 15 (3187 (a-o)) (BL47, Mi3123-2137), also back1999Explorer-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_back); (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 States3187d fdc1Stamp on FDC (BGC cachet)
United States3187d fdc2Stamp and (BGC) cachet (different) on FDC
United States3187d fdc3Stamp and (BGC) cachet (different) on FDC
United States3187d fdc4Stamp on FDC (different)
United States3187d fdc5Stamp on FDC (Colorano silk cachet)
United States3187d fdc6Stamp on FDC (Paul Calle/Chris Calle cachet)
United States3187d fdc7Stamp on FDC (Collins cachet)
United States3187d fdc8Stamp and (printed) cachet on FDC
United States3187d fdc9Stamp and (Hobby Link) cachet on FDC
United States3187d fdc10Stamp and (NF) cachet on FDC
United States3187d fdc11Stamp and (Cachet Craft Cachets) cachet on FDC
United States3187d fdc12Stamp and (D-?) cachet on FDC
United States3187d fdc13Stamp and (?) cachet on FDC
United States3187d fdc14Stamp and (Pugh Cachets) cachet on FDC
United States3187d fdc15Stamp and (Bevil) cachet on FDC
United States3187d fdc16Stamp and (printed) cachet on FDC
United States3187d fdc17Stamp and (Mystic Stamp Company) cachet on FDC, also back
United States3187d fdc18Stamp and (PCS golden-replica) cachet on FDC, also back
United States3187d fdc19Stamp and cancel and (Space Voyage) cachet on FDC
United States3187d fdc20Stamp and cancel (same) and (Space Voyage) cachet (different color) on FDC
United States3187d fdc21Stamp and (ArtCraft) cachet on FDC
United States3187d fdc22Stamp and (Dome) cachet on FDC
United States3187d fdc23Stamp and (S&T color laser) cachet on FDC
United States3187d fdc24Stamp and (Ranto/USPS bulletin) cachet on FDC, also back
United States3187d fdc25Stamp and (Pyrrhus hand-painted acrylic) cachet on FDC
United States3187d fdc26Stamp on FDC (SpaceCraft/Swanson cachet)
United States3187d fdc27Stamp and (PCS) cachet on FDC
United States3187 fdc1MS15 as FDC (no cachet)
United States3187 fdc2MS15 on FDC (Artmaster cachet)
United States3187a-o fdcOne of 15 stamps and cachet on FDC
United StatesSP1259F
SP1259F back
(USPS) souvenir page (3187)
United StatesCP537F
CP537F back
(USPS) commemorative panel (3187)
United States3187 book page 16Page 16 from (USPS) "1950s" bookJupiter-C launch of Explorer-1
United States3187 book page 17Page 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 States3188c fdc1 (Mi3173 fdc1)(Space Voyage) cachet on FDC1999"Explorer-1"
United States3188c fdc2 (Mi3173 fdc2)(Space Voyage) cachet (different color) on FDC
United States3188c fdc3 (Mi3173 fdc3)(Space Voyage) cachet (different color) on FDC
United States3189i fdc1 (Mi3233 fdc1)(Space Voyage) cachet on FDC
United States3189i fdc2 (Mi3233 fdc2)(Space Voyage) cachet (different color) on FDC
United States3188e fdc (Mi3175 fdc)(Space Voyage) cachet on FDC1999"Explorer-1"
United States3189i fdc (Mi3233 fdc)(Space Voyage) cachet on FDC1999
United States3190a fdc1 (Mi3243 fdc1)(Space Voyage) cachet (different color) on FDC2000
United States3190a fdc2 (Mi3243 fdc2)(Space Voyage) cachet (same) on FDC (different cancel)
United States3190a fdc3 (Mi3243 fdc3)(Space Voyage) cachet (different color) on FDC
United States3191h fdc (Mi3295 fdc)(Space Voyage) cachet (same) on FDC2000
United StatesNone(Mission 57) cachet on IGY cover back, also front2007"the US finally launched Explorer-1 on the first day of February in 1958" (in text)
Yugoslavia870 (Mi1216)1967"Explorer-1"


Below is a list of Explorer-1 satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).

CountryCancel DateCancel LocationType of ItemNotes on Content
1958-01-31: Explorer-1
United States1958-01-31Port Canaveral FL(Sarzin) cachet on coverExplorer-1 launch
United States1958-01-31Patrick AFB, FL(Goldcraft) cachet on coverExplorer-1 launch
United States1958-01-31Patrick AFB, FL(Purple rubber-stamp) cachet on coverExplorer-1 launch
United States1958-01-31Patrick AFB, FL(Swanson red rubber-stamp) cachet on coverExplorer-1 launch
Explorer-1 (events)
United States1970-03-31Cape Canaveral FL(SpaceCraft/Swanson) cachet on cover, also insertExplorer-1 re-entry
United States1970-03-31Houston TX(MSCS) cachet on coverExplorer-1 re-entry
Explorer-1 (anniversaries)
United States1968-01-31Cape Canaveral FL(Swanson blue and red rubber-stamp) cachet on cover10th anniv. Explorer-1 launch
United States1973-01-31Redstone Arsenal AL(MoF no.3) cachet on cover, also insert and insert back15th anniv. Explorer-1 launch
United States1973-01-31Patrick AFB, FL(Whitney purple) cachet on cover15th anniv. Explorer-1 launch
United States1973-01-31Cape Canaveral FL(Whitney purple) cachet on cover15th anniv. Explorer-1 launch
United States1973-01-31Cape Canaveral FL(Whitney purple) cachet on (airmail) cover15th anniv. Explorer-1 launch
United States1978-01-31Kennedy Space Center FL(Printed) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Cape Canaveral FL(MoF no.59) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Pasadena CA(Gold printed) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Cape Canaveral FL(Blue printed) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31WSMR, NM(Black rubber-stamp and typed) cachet on cover20th anniv. Explorer-1 launch (also rocket launch cover)
United States1978-01-31MSFC, AL(E&T) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Redstone Arsenal, AL(E&T) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Kennedy Space Center FL(blank/no) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Orlando FL, Kennedy Space Center Branch(Black rubber-stamp) cachet on cover20th anniv. Explorer-1 launch
United States1978-01-31Cape Canaveral FL(Whitney cyan) cachet (and signature) on (airmail) cover20th anniv. Explorer-1 launch
Yugoslavia1978-01-31ZagrebCancel and (printed) cachet on cover20th anniv. Explorer-1 launch
Yugoslavia1978-01-31ZagrebCancel (same) and (printed) cachet (different color shade) on cover20th anniv. Explorer-1 launch
United States1983-01-31Pasadena CACancel and (JPL Stamp Club) cachet on cover, also insert25th anniv. Explorer-1 launch
United States1983-01-31Pasadena CACancel (same) and (Space Voyage) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel and (Space Voyage) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) and (printed) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) and (Kennedy Space Center Philatelic Society) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) and cinderella on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) and (FMF Local Post) cachet (different) on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FLCancel (same) and (Titusville-Moonport Stamp Club) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Redstone Arsenal GA(FMF Local Post) cachet on cover25th anniv. Explorer-1 launch
United States1983-01-31Cape Canaveral FL(Whitney magenta) cachet on (airmail) cover25th anniv. Explorer-1 launch
United States
Russia (USSR)
1983-01-31
1982-10-04
Cape Canaveral FL
Kosmodrome Baikonur
Cancel (same) and (blue rubber-stamp) cachet on cover25th anniv. Explorer-1 launch
25th anniv. Sputnik-1 launch
United States
Russia (USSR)
1988-01-31
1987-10-04
Cape Canaveral FL
Kosmodrome Baikonur
(Green rubber-stamp) cachet on cover30th anniv. Explorer-1 launch
30th anniv. Sputnik-1 launch
United States1998-01-31Cape Canaveral FLCancel on postal card40th anniv. Explorer-1 launch
United States1998-01-31Cape Canaveral FLCancel (same) and (B&D) cachet on cover40th anniv. Explorer-1 launch
United States1998-01-31Cape Canaveral FLLocal post stamp and cancel (same) and (?) cachet on cover40th anniv. Explorer-1 launch; also IGY
Austria2008-01-31Vienna(Printed) cachet on cover50th 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
Spain2008-01-31MadridCancel and (?) cachet on cover50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (printed) cachet on cover50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (printed) cachet (same) and second cachet (different) on cover, also cachet on back50th anniv. Explorer-1 launch
United States2008-01-31Washington DC(Mission 57) cachet on cover, also back50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FL(Mission 57) cachet (same) on cover (different cancel), also back50th anniv. Explorer-1 launch
United States2008-01-31MSFC, ALCancel and (Mission 57) cachet (different) on cover, also back50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (Mission 57) cachet (same) on cover (different cancel), also back50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (Mission 57) cachet (different) on cover, also back50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (Mission 57) cachet (different) on cover, also back50th anniv. Explorer-1 launch
United States2008-01-31Pasadena CA(Personalized) stamp (design simialr to USA 3187d and cancel and (Therome Cachets) cachet on cover50th anniv. Explorer-1 launch
United States2008-01-31Pasadena CA(Personalized) stamp and cancel (same) and (Therome Cachets) cachet (different) on cover50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel and (printed) cachet on cover50th anniv. Explorer-1 launch
United States2008-01-31Cape Canaveral FLCancel on cover50th anniv. Explorer-1 launch
United States2008-01-31Pasadena CACancel and (JPL Stamp Club) cachet on cover50th anniv. Explorer-1 launch
United States2008-01-31Pasadena CA(Personalized) stamp and cancel (same) and (printed) cachet on cover50th anniv. Explorer-1 launch
Yugoslavia2008-01-31ZagrebCancel and (?) cachet on cover, also back50th anniv. Explorer-1 launch
United States2013-01-31Bourne Station MA(Coverscape) cachet on cover55th anniv. Explorer-1 launch
Explorer-1 (on other than Explorer-1 launch covers)
United States1963-02-14Cape Canaveral FL(Centennial dark-blue earth) cachet on Syncom-1 launch coverExplorer-1
United States1963-12-21Patrick AFB, FL(Sokolsky black printed and black rubber-stamp) cachet on TIROS-8 launch cover, also annotated cachetJupiter-C launch rocket with Explorer-1 mounted on top, compare with USA postcard 1958
United States1963-12-21Cape Canaveral FL(Sokolsky black printed and black rubber-stamp) cachet on TIROS-8 launch cover, also annotated cachet
United States1964-01-21Cape Canaveral FL(Centennial yellow earth) cachet on coverExplorer-1
United States1964-01-30Cape Canaveral FL(Sokolsky red printed and black rubber-stamp) cachet (and signatures) on Ranger-6 launch cover, also annotated cachetJupiter-C launch rocket with Explorer-1 mounted on top, compare with USA postcard 1958
United States1964-12-21Cape Canaveral FL (hand cancel)(Centennial orange earth) cachet on Explorer-26 launch coverExplorer-1
United States1964-12-21Cape Canaveral FL (machine cancel)(Centennial orange earth) cachet on Explorer-26 launch cover
United States1967-11-05Kennedy Space Center FL(Centennial orange earth) cachet on ATS-3 launch coverExplorer-1
United States1967-11-06Cape Canaveral FL (hand cancel)(Centennial orange earth) cachet on ATS-3 launch cover
United States1967-11-06Cape Canaveral FL (machine cancel)(Centennial orange earth) cachet on ATS-3 launch cover
United States1969-08-28Cape Canaveral FL(Centennial yellow earth) cachet on Pioneer-E and TETR-3 [failed] launch coverExplorer-1
United States1971-02-03Cape Canaveral FL(Centennial gray earth) cachet on NATO-2B launch coverExplorer-1
United States1975-02-14Kennedy Space Center FL(MoF no.24) insert from Pegasus-1 anniversary cover, also cover front"Explorer-1" (in text)
United States1999-06-19Pasadena CA(Pictorial) cancel on QuikScat launch coverExplorer-1
United States1999-09-23Pasadena CA(Pictorial) cancel on MCO event coverExplorer-1
United States1999-12-18Pasadena CA(Pictorial) cancel on EOS-Terra launch coverExplorer-1
United States1999-12-20Pasadena CA(Pictorial) cancel on Acrimsat launch coverExplorer-1
United States2000-10-06Pasadena CA(Pictorial) cancel on Ulysses anniversary coverExplorer-1
United States2001-11-26
2002-01-05
Pasadena CA
Pasadena CA
(Pictorial) cancel on Cassini-Huygens event coverExplorer-1
United States2001-12-07Pasadena CA(Pictorial) cancel on Jason-1 and TIMED launch coverExplorer-1
United States2011-03-04Vandenberg AFB, CA(Mission 57) cachet on Glory launch cover back, also front"The flight commemorates the 50th anniversary of Explorer-1" (in text)
United States2012-08-30Cape Canaveral FL(Mission 57) cachet on RBSP launch cover back, also front"Van Allen radiation belts, discovered by the very first American satellite in 1958" (in text, that satellite was Explorer-1)


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