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Orbiting Astronomical Observatory
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| OAO-1 | OAO-2 | OAO-B | OAO-3 |
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Orbiting Astronomical Observatory
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| OAO-1 | OAO-2 | OAO-B | OAO-3 |
This page contains philatelic information on the Orbiting Astronomical Observatory (OAO) series satellites. 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.
| 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) |
|---|---|---|---|
| OAO | OAO | OAO | OAO |
| OAO (on other than OAO launch covers) |
Below is a list of OAO-series satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
| Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
|---|---|---|---|---|
| Orbiting Astronomical Observatory (OAO) | ||||
| Benin | 502 (Mi256) i502 | Imperforate | 1980 | OAO-3 / Copernicus |
| Benin | 502 ds | Deluxe proof (502) | ||
| Benin | 502 proof1 | Signed proof (black) | ||
| Benin | 502 proof2 | Signed proof (green) | ||
| Benin | 502 proof3 | Signed proof (red-brown) | ||
| Benin | 502 proofs | Progressive proofs | ||
| Bhutan | 151D (Mi551) | Imperforate, plastic-overlay | 1973 | OAO-3 / Copernicus |
| Bhutan | 151Eg (BL59) | Imperforate MS2 (151D-E), plastic-overlay, also back | ||
| Central African Republic | 1174a (Mi1879A) i1174a (Mi1879B) | One of MS4 (1174 (a-d)) (Mi1879A-1882A) One of imperforate MS4 (i1174 (a-d)) (Mi1879B-1882B) | 1997 | "OAO-3" / "Copernic" (in text, but OAO-1 depicted) |
| Chad | 709a (Mi1511A) i709a (Mi1511B) | One stamp and in selvedge of MS6 (709 (a-f)) (Mi1511A-1516A) One stamp and in selvedge of imperforate MS6 (i709 (a-f)) (Mi1511B-1516B) | 1997 | OAO-B (not "OAO-3" / "Copernicus", as in selvedge text) |
| Chad | 923 (Mi2259) | 2001 | OAO-3 / Copernicus | |
| Chad | 923a (BL326A) i923a (BL326B) | SS1 (923) Imperforate SS1 (i923) | ||
| Chad | 923a fdc i923a fdc | SS1 and (multi-color printed) cachet on FDC Imperforate SS1 and (multi-color printed) cachet on FDC | ||
| Chad | 923b (BL unlisted) | MS4 (4x 923) | ||
| Dominica | 2237c (Mi2904) | One of MS6 (2237 (a-f)) (Mi2902-2907) | 2000 | OAO-3 / "Copernicus" |
| Dominica | 2237 fdc | MS6 on FDC | ||
| Equatorial Guinea | Mi1276A Mi1276B | Imperforate | 1978 | OAO-1 depicted (not "Cosmos-894", as in text) |
| Franklin Mint (USA) | None | (Bronze) medallion, also reverse | 1970s | "OAO-3" |
| Gambia | 799 (Mi819) | 1988 | "OAO-3" / Copernicus | |
| Germany (West) | None | Cinderella (poster stamp), one of MS30 cinderella | ~1966 | "OAO"-1 (launch was 1966, not 1965) |
| Germany (West) | None | (WERABA) cachet on cover | 1973 | "OAO-3" / "Copernicus" |
| Ghana | 166a (BL9) | In (upper-left) margin of imperforate MS4 (4x 166) | 1964 | OAO-21 |
| Ghana | 166a fdc | Imperforate MS4 on FDC | ||
| Italy | 1189 fdc (Mi1492 fdc) | (Filagrano Gold cachet) cachet of FDC, also back | 1975 | OAO-2 |
| Liberia | 657 (Mi900A) i657 (Mi900B) | Imperforate | 1973 | "Orbiting Astronomical Observatory (OAO-3) / Copernicus |
| Maldive Islands | 488 (BL23) | On stamp of SS1 | 1974 | OAO-3 / "Copernicus" |
| Mali | C301 (Mi570) | 1977 | OAO-1 | |
| Mali | C301 ds | Deluxe sheet (C301) | ||
| Mali | C301 fdc | Stamp and (République du Mali Postes et Télécommunications) cachet on FDC | ||
| Nigeria | 143a (Mi134) i143a | In (upper-left) margin of MS12 (12x 143) In (upper-left) margin of "imperforate"2 MS12 (12x 143) | 1963 | OAO-21 |
| Nigeria | 144a (Mi135) i144a | In (upper-left) margin of MS12 (12x 144) In (upper-left) margin of "imperforate"2 MS12 (12x 144) | ||
| Poland | None | (Pictorial) cancel | 1973 | OAO-3 / "Copernicus" |
| Poland | 1979 (Mi2256) | Stamp from MS6 (1979a (6x 1979 + 2 labels)) (BL54) | 1973 | OAO-3 / Copernicus |
| Poland | 1979 fdc | Stamp and (pictorial) cancel on FDC | ||
| Poland | 2248a (Mi2539) | On (left) selvedge of MS6 (6x 2248 + 2 labels), also annotated | 1977 | OAO-3 / Copernicus |
| Poland | 2366 (Mi2660) | Also detail | 1979 | OAO-3 / "Copernicus" |
| Poland | 2366 fdc | Stamp on FDC | ||
| Poland | 2369a (BL80) | On one of MS5 (2365-2369 + label) | ||
| Satellite Beach FL (USA) | Local | set-C10 (blue) | 1964 | "OAO"-1 |
| Satellite Beach FL (USA) | Local o/p | set-C10 (blue) overprinted in gold | 1965 | "OAO"-1 |
| Sharjah | 42 (Mi54A) i42 (Mi54B) | Imperforate | 1964 | OAO-21 |
| Sharjah | 42_op (Mi54A_op) i42_op | 42 overprinted new currency i42 overprinted new currency | ||
| Sierra Leone | 622 (BL21) | SS1 | 1984 | OAO-B (in a totally inappropriate situation) |
| Switzerland | None | (WERABA-73) cachet on cover | 1973 | "OAO-3" / "Copernicus" |
| Switzerland | None | (WERABA-73) cachet on cover (slightly different) | 1973 | "OAO-3" / "Copernicus" |
| Togo | 500 (Mi446A) i500 (Mi446B) | Imperforate | 1964 | OAO-1 |
| Togo | 504 (Mi450A) i504 (Mi450B) | Imperforate | ||
| Togo | 500-501+503 fdc | One of three stamps on FDC | ||
| Togo | 500-505 fdc | Two of six stamps on FDC | ||
| Togo | 502+504-505 fdc | One of three stamps on FDC | ||
| Togo | 505a (BL17) | Imperforate MS4 (502-505) | ||
| Togo | 505a fdc | Imperforate MS4 on FDC | ||
| United Nations (Geneva) | 46 fdc (Mi46 fdc) | (Space Voyage) cachet on FDC, also detail | 1975 | "OAO-3" / "Copernicus" |
| United States | None | Memento | 1972 | OAO-3 / "Copernicus" |
| United States | 1488 fdc (Mi1095 fdc) | (Green rubber-stamp) cachet on FDC (IASP printed cachet) | 1973 | OAO-B (not "OAO-3" / "Copernicus", as in text) |
| United States | None | (Midwest Postage Stamp and Coin Show Station) cancel on (UX65) postal card | 1973 | OAO-3 / "Copernicus" |
| United States | None | (Midwest Postage Stamp and Coin Show Station) cancel on cover | 1973 | OAO-3 / "Copernicus" |
| United States | 1759 fdc 1710 cover | (Aeropex'77) cachet on FDC, also annotated | 1978 1977 | "OAO" [#4 in annotated cachet image] |
| United States | None | (GSFC multi-satellite blue rubber-stamp) cachet on cover | 1979 | "OAO" |
| United States | None | (Rumex / Gill Craft) cachet on cover | 1984 | OAO-1 |
| United States | 3188e+j+m fdc (Mi? fdc) | (CW Ray hand-painted) cachet on FDC | 1999 | OAO-B |
| Yemen Arab Republic | C86 (Mi1697) | 1982 | OAO-21 | |
| Yemen Arab Republic | C86 ds | Deluxe sheet (C86) | ||
| Yemen Arab Republic | C86 proof | Chromalin-proof | ||
1These items are noted as depicting OAO-2 satellites based on the rectangular solar panels and the hexagonal body shape.
2The "imperforate" sheets from Nigeria, i143a and i144a, are imperforate only in the surrounding margins, otherwise the stamps in both sheets are perforated on all sides.
Below is a list of OAO-series satellite launch covers (including anniversary-of-launch covers, and launch-related event covers).
| Country | Cancel Date | Cancel Location | Type of Item | Notes on Content |
|---|---|---|---|---|
| Orbiting Astronomical Observatory (OAO) | ||||
| 1966-04-08: OAO-1 | ||||
| United States | 1966-04-08 | Kennedy Space Center FL | (Black typed) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Kennedy Space Center FL | (Black typed) cachet (different text arrangement) on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL | (Sarzin) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Patrick AFB, FL | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-1 launch (but OAO-2 depicted) |
| United States | 1966-04-08 | Patrick AFB, FL | (SpaceCraft/Swanson) cachet (and signature) on cover, also insert | OAO-1 launch (but OAO-2 depicted) |
| United States | 1966-04-08 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-1 launch (but OAO-2 depicted) |
| United States | 1966-04-08 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet (and signature) on cover, also insert | OAO-1 launch (but OAO-2 depicted) |
| United States | 1966-04-08 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet (and signature, different) on cover, also insert | OAO-1 launch (but OAO-2 depicted) |
| United States | 1966-04-08 | Cape Canaveral FL | (Astro Covers, no logo) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL (machine cancel) | (Centennial) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL (hand cancel) | (Centennial and black rubber-stamp) cachet on cover | OAO-1 launch (not "Explorer-31" as in rubber-stamp cachet) |
| United States | 1966-04-08 | Cape Canaveral FL | (Orbit Covers, no logo) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL | (Sokalsky orange) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL | (Sokalsky orange, and purple rubber-stamp) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL | (HJM black and Swanson/DuBeau? purple rubber-stamp) cachet on cover | OAO-1 launch |
| United States | 1966-04-08 | Cape Canaveral FL | (Swanson/DuBeau? blue and purple rubber-stamp) cachet on (airmail) cover | OAO-1 launch |
| United States | 1966-04-08 1991-10-01 | Cape Canaveral FL Pasadena CA | (Blue printed) cachet on cover (also extra Sharjah 42 stamp) | OAO-1 launch USA 2570-2571 FDC |
| 1968-12-07: OAO-2 / Stargazer | ||||
| United States | 1968-12-07 | Patrick AFB, FL (hand cancel) | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-2 launch |
| United States | 1968-12-07 | Patrick AFB, FL (machine cancel) | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-2 launch |
| United States | 1968-12-07 | Patrick AFB, FL (machine cancel) | (SpaceCraft/Swanson) cachet (and signature) on cover, also insert | OAO-2 launch |
| United States | 1968-12-07 | Cape Canaveral FL (hand cancel) | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-2 launch |
| United States | 1968-12-07 | Cape Canaveral FL (machine cancel) | (SpaceCraft/Swanson) cachet on cover, also insert | OAO-2 launch |
| United States | 1968-12-07 | Cape Canaveral FL (machine cancel) | (Centennial red Orbiting Observatories and black text) cachet on cover | (early-design) OAO-21 launch (also OSO-1/6 type and OGO-1/6 type depicted) |
| United States | 1968-12-07 | Cape Canaveral FL (hand cancel) | (Centennial red Orbiting Observatories and black text) cachet on cover | (early-design) OAO-21 launch (also OSO-1/6 type and OGO-1/6 type depicted) |
| United States | 1968-12-07 | Cape Canaveral FL | (HJM black and red typed) cachet on cover | OAO-2 launch |
| United States | 1968-12-07 | Cape Canaveral FL | (Orbit Covers) cachet on cover | OAO-2 launch (but OAO-1 depicted) |
| United States | 1968-12-07 | Kennedy Space Center FL | (Artopages) cachet on cover | OAO-2 launch |
| United States | 1968-12-07 | Cape Canaveral FL | (Sarzin) cachet on cover | OAO-2 launch |
| United States | 1968-12-07 | Kennedy Space Center FL | (R. DuBeau magenta rubber-stamp) cachet on cover | OAO-2 launch |
| 1970-11-30: OAO-B / Goddard [failed] | ||||
| United States | 1970-11-30 | Cape Canaveral FL | (Orbit Covers) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Orbit Covers) cachet (and signature) on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Patrick AFB, FL | (Solar Covers no.6 (assigned)) cachet on cover, also insert | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Solar Covers no.6 (assigned)) cachet on cover, also insert | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (Solar Covers no.6 (assigned)) cachet on cover, also insert | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (C. Swanson/DuBeau? magenta and blue and black rubber-stamp) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (C. Swanson/DuBeau? magenta and blue and black rubber-stamp) cachet on (airmail) cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Riser/Andromeda Cover no.21) cachet on (airmail) cover, also insert | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Riser/Andromeda Cover no.21) cachet (and signature) on (airmail) cover, also insert | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (Blue rubber-stamp and black typed) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Patrick AFB, FL | (Whitney purple and cyan) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Whitney purple and cyan) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Centennial) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Cape Canaveral FL | (Centennial yellow earth) cachet on cover | OAO-B launch [failed] (but Relay, Vanguard-2, Pioneer-3/4 type, Explorer-1, TIROS/ESSA type depicted) |
| United States | 1970-11-30 | Cape Canaveral FL | (Space Voyage) cachet on cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| United States | 1970-11-30 | Satellite Beach FL | (Space Voyage) cachet on cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| United States | 1970-11-30 | Kennedy Space Center FL (hand cancel) | (Space Voyage) cachet on cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| United States | 1970-11-30 | Kennedy Space Center FL (machine cancel) | (Space Voyage) cachet on cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| United States | none (1970-11-30) | none | (Space Voyage) cachet on (un-stamped and un-canceled) cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| United States | 1970-11-30 | Kennedy Space Center FL | (R. DuBeau blue rubber-stamp) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (R. DuBeau blue rubber-stamp) cachet (and signature) on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (R. DuBeau magenta rubber-stamp) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (Carlos Altgelt) cachet on cover, also cachet detail | OAO-B launch [failed]; (but tiny Intelsat-2 depicted) |
| United States | 1970-11-30 | Cape Canaveral FL | (Centennial-like) cachet on cover | OAO-B launch [failed] |
| United States | 1970-11-30 | Kennedy Space Center FL | (Blue printed, based on a Sokalsky design) cachet on cover | OAO-B launch [failed] |
| United States | 1970-12-01 | Kennedy Space Center FL (machine cancel) | (Space Voyage) cachet on cover, also insert | OAO-B launch [failed]; (also "OAO-1 and 2" in insert text) |
| 1972-08-21: OAO-3 / Copernicus | ||||
| United States | 1972-08-21 | Cape Canaveral FL | (Space Voyage) cachet on cover, also insert | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Space Voyage) cachet on cover, also insert | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Space Voyage) cachet (and signatures) on cover, also insert | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Space Voyage) cachet (different) on cover, also insert | OAO-3 launch |
| United States | 1972-08-21 | Greenbelt MD | (GSFC Stamp Club) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Greenbelt MD | (GSFC Stamp Club) cachet (and signatures) on cover | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Riser/Andromeda/Cygnus Cover no.31) cachet on (airmail) cover, also insert | OAO-3 launch (but OAO-B depicted) |
| United States | 1972-08-21 | Kennedy Space Center FL | (Solar Covers no.43 or 44 or 45 (assumed)) cachet on cover | OAO-3 launch (but OAO-B depicted) |
| United States | 1972-08-21 | Cape Canaveral FL | (Orbit Covers) cachet on cover | OAO-3 launch (but OAO-B depicted) |
| United States | 1972-08-21 | Kennedy Space Center FL | (Polonus Philatelic Society) cachet on cover | OAO-3 launch (but OAO-B depicted) |
| United States | 1972-08-21 | Kennedy Space Center FL | (Red printed) cachet on cover | OAO-3 launch (but OAO-B depicted) |
| United States | 1972-08-21 | Cape Canaveral FL | (Sarzin) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Cape Canaveral FL | (Whitney magenta and black) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Patrick AFB, FL | (Whitney magenta and black) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Satellite Beach FL | (Whitney magenta and black) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Centennial) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (R. DuBeau magenta rubber-stamp) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Cape Canaveral FL | (Swanson/DuBeau? purple and black rubber-stamp) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 | Kennedy Space Center FL | (Blue mission patch) cachet on cover | OAO-3 launch |
| United States | 1972-08-21 1973-04-19 | Army Postal Service Army Postal Service | (Pictorial) cancel and red text on cover | OAO-3 launch IK-9 launch |
| OAO (on other than OAO launch covers) | ||||
| There exist a large number of Centennial Covers with generic cachets with multiple satellites depicted, including OAO-2. Details about these cachets, as well as images of the covers, are found in the Centennial Covers page. | ||||
| United States | 1962-04-28 | Vandenberg AFB, CA | (SpaceCraft Type-A general-purpose and blue rubber-stamp) cachet on KH4-3 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-05-10 | Patrick AFB, FL | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet on ANNA-1 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-05-15 | Vandenberg AFB, CA | (SpaceCraft Type-A general-purpose and blue rubber-stamp) cachet on KH5-5 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-05-29 | Vandenberg AFB, CA | (SpaceCraft Type-A general-purpose and blue rubber-stamp) cachet on KH4-4 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-07-10 | Patrick AFB, FL | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet on Telstar-1 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-07-18 | Lompoc CA | (SpaceCraft Type-A general-purpose and magenta rubber-stamp) cachet on SAMOS-9 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-08-01 | Vandenberg AFB, CA | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet on KH4-10 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-08-27 | Patrick AFB, FL | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet on Mariner-2 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-10-03 | USS Walker | (SpaceCraft Type-A general-purpose) cachet on Mercury-MA-8 splashdown/recovery cover, also back | (early-design) OAO-21 (upper-left) |
| United States | 1962-10-18 | Cape Canaveral FL | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet on Ranger-5 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1962-12-18 | Lompoc CA | (SpaceCraft Type-A general-purpose and magenta rubber-stamp) cachet on Transit-5A-1 launch cover, also back | (early-design) OAO-21 (upper-left) |
| United States | 1964-04-16 | Wallops Island VA | (SpaceCraft Type-A general-purpose and purple rubber-stamp) cachet (and signature) on (sub-orbital) rocket launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1968-03-04 | Cape Canaveral FL (machine cancel) | (SpaceCraft/Swanson) insert or insert variation (slightly different text arrangement) from OGO-5 launch cover, also front | "OAO" and "OAO (Future)"2 |
| United States | 1968-03-04 | Cape Canaveral FL (hand cancel) | (SpaceCraft/Swanson) insert or insert variation (slightly different text arrangement) from OGO-5 launch cover, also front | |
| United States | 1968-03-04 | Patrick AFB, FL (hand cancel) | (SpaceCraft/Swanson) insert or insert variation (slightly different text arrangement) from OGO-5 launch cover, also front | |
| United States | 1968-03-04 | Patrick AFB, FL (machine cancel) | (SpaceCraft/Swanson) insert or insert variation (slightly different text arrangement) from OGO-5 launch cover, also front | |
| United States | 1971-07-26 | Moon KY | (SpaceCraft Type-A general-purpose) cachet on Apollo-15 launch cover | (early-design) OAO-21 (upper-left) |
| United States | 1976-03-16 | Auburn MA | (GSFC Stamp Club blue printed) cachet on 50th anniv. first liquid fuel rocket flight/launch cover | "OAO" |
| United States | 1978-05-20 | GSFC, MD | (GSFC multi-satellite blue rubber-stamp) cachet (same design as immediately above) on Pioneer-12 launch cover | "OAO" |
| United States | 1978-10-24 | GSFC, MD | (GSFC multi-satellite blue rubber-stamp) cachet (same) on Nimbus-7 and CAMEO launch cover | "OAO" |
| United States | 1983-01-25 | Greenbelt MD | (GSFC multi-satellite blue rubber-stamp) cachet (same) on IRAS and PIX-2 launch cover | "OAO" |
1These items are noted as depicting OAO-2 satellites based on the rectangular solar panels and the hexagonal body shape.
2"OAO (Future)" was likely meant to read "OSO (Future)" to match the design of AOSO.
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