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ESRO
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| ESRO-1A | ESRO-2B | ESRO-2 (Swanson sketch) |
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ESRO
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| ESRO-1A | ESRO-2B | ESRO-2 (Swanson sketch) |
This page contains philatelic information on the ESRO (European Scientific Research Organization) 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.
The ESRO-2A/2B / IRIS-1/2 series from 1967/1968 should not be confused with either the Astro-F / Akari / IRIS satellite from 2006, or with the Explorer-94 / IRIS / SMEX-12 satellite from 2013, or with the Russian IRIS satellite from 2009.
| 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) |
|---|---|---|---|
| ESRO (ESRO) | ESRO (ESRO) | ESRO (ESRO) | ESRO (ESRO) |
| ESRO (on other than ESRO launch covers) |
Below is a list of ESRO-series postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
| Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
|---|---|---|---|---|
| European Scientific Research Organization (ESRO) (ESRO) | ||||
| Benin | Unknown c (Mi none) Unknown ic | One of MS4 (a-d) [known illegal issue] One of imperforate MS4 (a-d) | 2014 | "ESRO-4" (also launch date in text) |
| Benin | Unknown a-d fdc | One of four stamps on FDC | ||
| Benin | Unknown c proof Unknown ic proof | One of MS4 proof (a-d) One of imperforate MS4 proof (a-d) | ||
| Benin | Unknown ms proof | Signed-proof MS4 (a-d) | ||
| Benin | Unknown ms proof fdc Unknown ims proof fdc | MS4 proof on FDC Imperforate MS4 proof on FDC | ||
| Benin | Unknown d (Mi?) Unknown id | One of MS4 (a-d) One of imperforate MS4 (a-d) | 2014 | "ESRO-1" (also launch date in text) |
| Benin | Unknown a-d fdc | One of four stamps on FDC | ||
| Benin | Unknown d proof Unknown id proof | One of MS4 proof (a-d) One of imperforate MS4 proof (a-d) | ||
| Benin | Unknown ms proof | Signed-proof MS4 (a-d) | ||
| Benin | Unknown ms proof fdc Unknown ims proof fdc | MS4 proof on FDC Imperforate MS4 proof and (multi-color printed) cachet on FDC | ||
| Gabon | Unknown d (Mi none) Unknown id | One of MS4 (a-d) [known illegal issue] One of imperforate MS4 (a-d) | 2017 | "ESRO-1" (also launch date in text) |
| Gabon | Unknown ms proof | Signed-proof MS4 (a-d) | ||
| Gabon | Unknown ms fdc Unknown ims fdc | MS4 on FDC Imperforate MS4 on FDC | ||
| Gabon | Unknown a-d fdc | One of four stamps on FDC | ||
| Germany (West) | None | (ESRO) cachet on cover | 1968 | "ESRO" |
| Panama | C365f (Mi1142) | One stamp and on (right) selvedge of MS6 (C365 (a-f)) (Mi1137-1142) | 1969 | "ESRO-2" |
| Paraguay | 1220 (BL134) | On stamp of SS1 | 1969 | "ESRO-1B" |
| Paraguay | 1220 muestra | SS1 overprinted "muestra" | ||
| United States | None | (R.E. Nichol) cachet on cover, also back | 1969 | "ESRO" (tiny satellite in red, above "G" in text) |
| United States | None | (DuBeau?/Swanson cyan rubber-stamp) cachet on (airmail) cover | 1970 | ESRO-2A1 |
1This Swanson blue rubber-stamp cachet has radial antennas like those on ESRO-2A.
Below is a list of ESRO-series launch covers (including anniversary-of-launch covers, and launch-related event covers).
| Country | Cancel Date | Cancel Location | Type of Item | Notes on Content |
|---|---|---|---|---|
| European Scientific Research Organization (ESRO) (ESRO) | ||||
| 1967-05-29: ESRO-2A / IRIS-1 [failed] | ||||
| United States | 1967-05-29 | Vandenberg AFB, CA | (SpaceCraft/Swanson) cachet (with ESRO logo in low position) on cover, also insert1 and insert2 front and insert2 back | ESRO-2A launch [failed] (also "ESRO-1" on insert2, and "TD-1" (TD-1A) and "TD-2" [canceled] on insert2 back) |
| United States | 1967-05-29 | Vandenberg AFB, CA | (SpaceCraft/Swanson) cachet (with ESRO logo in high position) on cover, also insert1 and insert2 front and insert2 back | ESRO-2A launch [failed] (also "ESRO-1" on insert2, and "TD-1" (TD-1A) and "TD-2" [canceled] on insert2 back) |
| United States | 1967-05-29 | Vandenberg AFB, CA | (Centennial) cachet on cover | ESRO-2A launch [failed] |
| United States | 1967-05-29 | Vandenberg AFB, CA | (Orbit Covers) cachet on cover | ESRO-2A launch [failed] |
| United States | 1967-05-29 | Vandenberg AFB, CA | (Sarzin) cachet on cover | ESRO-2A launch [failed] (but TIROS depicted) |
| United States | 1967-05-29 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on cover | ESRO-2A launch [failed] |
| United States | 1967-05-29 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on (airmail) cover | ESRO-2A launch [failed] |
| United States | 1967-05-29 | Vandenberg AFB, CA | (DuBeau?/Swanson magenta rubber-stamp) cachet on cover | ESRO-2A launch [failed] |
| United States Australia | 1967-05-29 1966-05-24 | Lompoc CA, Vandenberg AFB Woomera SA | (Rank silkscreened) cachet on cover | ESRO-2A launch [failed] Europa-1-F4 (sub-orbital) rocket launch |
| United States | 1967-06-01 | Lompoc CA | (Black rubber-stamp) cachet (and signature) on cover | ESRO-2A launch [failed] |
| 1968-05-16: ESRO-2B / IRIS-2 | ||||
| Germany (West) | 1968-05-12 | Ottobrunn | (JFM?) cachet on cover | ESRO-2B launch |
| United States | 1968-05-16 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on cover | ESRO-2B launch |
| United States | 1968-05-16 | Vandenberg AFB, CA | (Orbit Covers) cachet on cover | ESRO-2B launch |
| United States | 1968-05-16 | Vandenberg AFB, CA | (Orbit Covers, with missing "8" in "5-16-6") cachet on cover | ESRO-2B launch |
| United States | 1968-05-16 | Lompoc CA, Vandenberg AFB | (SpaceCraft/Swanson orange) cachet on cover, also insert or insert variation (slightly different line lengths) | ESRO-2B launch |
| United States | 1968-05-16 | Lompoc CA, Vandenberg AFB | (SpaceCraft/Swanson red) cachet on cover, also insert or insert variation (slightly different line lengths) | ESRO-2B launch |
| United States | 1968-05-16 | Vandenberg AFB, CA | (SpaceCraft/Swanson) cachet on cover, also insert or insert variation (slightly different line lengths) | ESRO-2B launch |
| United States | 1968-05-16 | Vandenberg AFB, CA | (Centennial) cachet on cover | ESRO-2B launch |
| United States | 1968-05-16 | Lompoc CA | (Black rubber-stamp) cachet (and signature) on cover | ESRO-2B launch |
| ESRO-2B / IRIS-2 (anniversaries) | ||||
| France | 1973-05-17 | Neuilly Sablons | (ESTEC Philatelic Club) cachet on cover | 5th anniv. ESRO-2B launch (one ESRO satellite and one unknown/fantasy spacecraft depicted) |
| Germany | 1978-05-17 | Darmstadt | (Club philatélique ESA-Lollini) cachet on cover | 10th anniv. ESRO-2B launch |
| Netherlands | 1978-05-17 | Noordwijk | (ESTEC Philatelic Club) cachet on cover | 10th anniv. ESRO-2B launch |
| 1968-10-03: ESRO-1A / Aurorae | ||||
| United States | 1968-10-03 | Vandenberg AFB, CA | (SpaceCraft/Swanson) cachet on cover, also insert1 and insert2 front and insert2 back | ESRO-1A launch ("ESRO-2A" and "ESRO-2B" on insert2 back) |
| United States | 1968-10-03 | Vandenberg AFB, CA | (Orbit Covers) cachet on cover | ESRO-1A launch |
| United States | 1968-10-03 | Vandenberg AFB, CA | (Sarzin?) cachet on cover | ESRO-1A launch |
| United States | 1968-10-03 | Vandenberg AFB, CA | (Swanson/DuBeau? blue rubber-stamp) cachet on cover | ESRO-1A launch |
| 1969-10-01: ESRO-1B / Boreas | ||||
| United States | 1969-10-01 | Vandenberg AFB, CA | (Orbit Covers) cachet on cover | ESRO-1B launch |
| United States | 1969-10-01 | Lompoc CA, Vandenberg AFB | (SpaceCraft/Swanson) cachet on cover, also insert1 and insert2 front and insert2 back | ESRO-1B launch; also "ESRO-1" [referring to ESRO-1A] (in text on insert2 front and back); "ESRO-II" (ESRO-2), "ESRO-IIA" (ESRO-2A) and "ESRO-II(B)" (ESRO-2B) (all in text on insert2 back) |
| United States | 1969-10-01 | Vandenberg AFB, CA | (SpaceCraft/Swanson) cachet on cover, also insert1 and insert2 front and insert2 back | ESRO-1B launch; also "ESRO-1" [referring to ESRO-1A] (in text on insert2 front and back); "ESRO-II" (ESRO-2), "ESRO-IIA" (ESRO-2A) and "ESRO-II(B)" (ESRO-2B) (all in text on insert2 back) |
| United States | 1969-10-01 | Vandenberg AFB, CA | (Swanson/DuBeau? blue rubber-stamp) cachet on cover | ESRO-1B launch |
| United States | 1969-10-01 | Vandenberg AFB, CA | (Sarzin) cachet on cover | ESRO-1B launch |
| United States | 1969-10-01 | Lompoc CA, Vandenberg AFB | (Centennial) cachet on cover | ESRO-1B launch |
| United States | 1969-10-01 | Lompoc CA, Vandenberg AFB | (ikarus-cover) cachet on cover | ESRO-1B launch |
| United States | 1969-10-02 | Fairbanks AK | (Red rubber-stamp) cachet (return address) on cover | ESRO-1B launch |
| 1972-03-11: ESRO-TD1A | ||||
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Space Voyage) cachet on cover, also insert | ESRO-TD1A launch |
| United States | 1972-03-11 | Vandenberg AFB, CA | (Orbit Covers orange) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Vandenberg AFB, CA | (Orbit Covers gold) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Vandenberg AFB, CA | (Orbit Covers yellow-orange) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Riser/Andromeda/Cygnus Cover no.18) cachet on (airmail) cover, also insert | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Solar Covers no.35) cachet on cover, also insert | ESRO-TD1A launch |
| United States | 1972-03-11 | Vandenberg AFB, CA | (DuBeau?/Swanson green rubber-stamp) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on (airmail) cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Black printed) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Blue printed and blue rubber-stamp) cachet on cover, also insert | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (Centennial) cachet on cover | ESRO-TD1A launch |
| United States | 1972-03-11 | Lompoc CA, Vandenberg AFB | (ESRO/CERS logo) cachet on cover | ESRO-TD1A launch; also ESRO-1 in the ESRO/CERS logo |
| Germany (West) | 1972-03-12 | Bochum | (InterCover) cachet on cover | ESRO-TD1A launch |
| Germany (West) | 1972-03-13 | Darmstadt | (Eberhard Cölle? black rubber-stamp) cachet on cover | ESRO-TD1A launch |
| 1972-11-21: ESRO-4 | ||||
| United States | 1972-11-21 | Vandenberg AFB, CA | (Space Voyage) cachet on cover, also insert | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (InterSpace Cover) cachet on cover, also insert | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Sarzin) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Riser/Andromeda/Cygnus Cover no.41) cachet on (airmail) cover, also insert1 and insert2 | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Orbit Covers orange) cachet on cover | ESRO-4 launch (but ESRO-TD1A depicted) |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Orbit Covers yellow) cachet on cover | ESRO-4 launch (but ESRO-TD1A depicted) |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Sarzin?) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Lompoc CA | (Polar Covers) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Lompoc CA, Vandenberg AFB | (Polar Covers) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Goldcraft? black printed) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Fairbanks AK | (ESRO return-address and hand-written) cachet on (airmail) cover | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Centennial) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Swanson/DuBeau? black rubber-stamp) cachet on cover | ESRO-4 launch |
| United States | 1972-11-21 | Vandenberg AFB, CA | (Black printed, but upside-down) cachet on cover | ESRO-4 launch |
| Australia | 1972-11-22 | Woomera SA | (WRE) cachet on cover | ESRO-4 launch |
| Australia | 1972-11-22? | Canberra City ACT | (Orroral Valley STADAN Station black and magenta printed) cachet (and signature) on cover | ESRO-4 launch |
| Germany (West) | 1972-11-22 | Darmstadt | (Brown rubber-stamp) cachet on cover | ESRO-4 launch |
| Germany (West) | 1972-11-22 | Darmstadt | (ESOC purple rubber-stamp) cachet on cover | ESRO-4 launch |
| Australia | 1972-11-23 | Canberra City ACT | (NASA Honeysuckle Creek cyan rubber-stamp) cachet on cover | ESRO-4 launch |
| ESRO (on other than ESRO launch covers) | ||||
| United States | 1967-11-10 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on ESSA-6 launch cover | ESRO-2A1 |
| United States | 1968-08-16 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on ESSA-7 launch cover | ESRO-2A1 |
| United States | 1968-08-16 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on ESSA-7 launch (airmail) cover | |
| United States | 1968-12-05 | Cape Canaveral FL | (ESRO) cachet on HEOS-1 launch cover | "ESRO" |
| United States | 1968-12-05 | Patrick AFB, FL (hand cancel) | (SpaceCraft/Swanson) insert from HEOS-1 launch cover, also front | "ESRO-I" (ESRO-1) and "ESRO-II" (ESRO-2) |
| United States | 1968-12-05 | Patrick AFB, FL (machine cancel) | (SpaceCraft/Swanson) insert from HEOS-1 launch cover, also front | |
| United States | 1968-12-05 | Cape Canaveral FL (hand cancel) | (SpaceCraft/Swanson) insert from HEOS-1 launch cover, also front | |
| United States | 1968-12-05 | Cape Canaveral FL (machine cancel) | (SpaceCraft/Swanson) insert from HEOS-1 launch cover, also front | |
| United States | 1968-12-15 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on ESSA-8 launch cover | ESRO-2A1 |
| United States | 1969-04-15 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-21 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1969-04-15 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-21 launch (airmail) cover | |
| United States | 1969-06-21 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue and magenta rubber-stamp) cachet on Explorer-41 launch cover | ESRO-2A1 |
| United States | 1970-01-23 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue and magenta rubber-stamp) cachet on TIROS-M and OSCAR-5 launch cover | ESRO-2A1 |
| United States | 1970-01-23 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue and magenta rubber-stamp) cachet on TIROS-M and OSCAR-5 launch (airmail) cover, also back | |
| United States | 1970-04-08 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson cyan rubber-stamp) cachet on Nimbus-4 and Topo-1 launch cover | ESRO-2A1 |
| United States | 1970-04-08 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on Nimbus-4 and Topo-1 launch cover | |
| United States | 1970-06-25 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-27 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1970-08-26 | Vandenberg AFB, CA | (DuBeau/Swanson blue rubber-stamp) cachet on Strawman-3 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1970-10-23 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-29 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1970-10-23 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson cyan rubber-stamp) cachet on KH8-29 launch (airmail) cover | |
| United States | 1970-12-11 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on NOAA-1 and CEP-1 launch cover | ESRO-2A1 |
| United States | 1970-12-11 | Lompoc CA, Vandenberg AFB | (DuBeau?/(Swanson cyan rubber-stamp) cachet on NOAA-1 and CEP-1 launch (airmail) cover | |
| United States | 1971-01-21 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson cyan rubber-stamp) cachet on KH8-30 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-02-16 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on DSAP-5A-F3 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-02-17 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH4B-13 and P801-3 [failed] launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-03-24 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson cyan rubber-stamp) cachet on KH4B-14 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-03-24 | Vandenberg AFB, CA | (DuBeau?/Swanson cyan rubber-stamp) cachet on KH4B-14 launch cover | |
| United States | 1971-04-22 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-31 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-04-22 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-31 launch cover | |
| United States | 1971-07-16 | Vandenberg AFB, CA | (DuBeau/Swanson black rubber-stamp) cachet on Strawman-4 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1971-11-13 | Lompoc CA, Vandenberg AFB | (Pt. Arguello Tracking Station//DuBeau?/Swanson red rubber-stamp) cachet on Mariner-9 event cover | ESRO-2A1 |
| United States | 1971-11-13 | Lompoc CA, Vandenberg AFB | (Pt. Arguello Tracking Station//DuBeau?/Swanson red rubber-stamp) cachet on Mariner-9 event (airmail) cover | |
| United States | 1971-11-13 | Vandenberg AFB, CA | (Pt. Arguello Tracking Station//DuBeau?/Swanson red rubber-stamp) cachet on Mariner-9 event cover | |
| United States | 1971-12-14 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on Poppy-7A/7B/7C/7D launch cover | ESRO-2A1 |
| United States | 1972-01-31 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson black rubber-stamp) cachet on HEOS-2 launch cover | ESRO-2A1 |
| United States | 1972-01-31 | Vandenberg AFB, CA | (DuBeau?/Swanson black rubber-stamp) cachet on HEOS-2 launch cover | |
| United States | 1972-03-17 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson black rubber-stamp) cachet on KH8-34 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1972-03-17 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson black rubber-stamp) cachet on KH8-34 launch (airmail) cover | |
| United States | 1972-03-17 | Vandenberg AFB, CA | (DuBeau?/Swanson black rubber-stamp) cachet on KH8-34 launch cover | |
| United States | 1972-05-25 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH4B-17 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1972-05-25 | Vandenberg AFB, CA | (DuBeau?/Swanson green rubber-stamp) cachet on KH4B-17 launch cover | |
| United States | 1972-09-01 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-36 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1972-09-01 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-36 launch cover | |
| United States | 1972-10-02 | Vandenberg AFB, CA | (DuBeau?/Swanson purple rubber-stamp) cachet on Radcat-2 and Radsat launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1972-10-02 | Vandenberg AFB, CA | (DuBeau?/Swanson magenta rubber-stamp) cachet on Radcat-2 and Radsat launch (airmail) cover | |
| United States | 1972-12-10 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on Nimbus-5 launch cover | ESRO-2A1 |
| United States | 1972-12-10 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on Nimbus-5 launch (airmail) cover | |
| United States | 1973-05-16 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson black rubber-stamp) cachet on KH8-38 launch cover | ESRO-2A1 ("secret satellite") |
| United States | 1973-05-16 | Vandenberg AFB, CA | (DuBeau?/Swanson black rubber-stamp) cachet on KH8-38 launch cover | |
| United States | 1973-12-15 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on Explorer-51 launch cover | ESRO-2A1 |
| United States | 1974-06-06 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on KH8-42 launch cover | ESRO-2A1 |
| United States | 1974-08-30 | Vandenberg AFB, CA | (DuBeau?/Swanson blue rubber-stamp) cachet on ANS launch cover | ESRO-2A1 |
| United States | 1974-08-30 | Lompoc CA, Vandenberg AFB | (DuBeau?/Swanson blue rubber-stamp) cachet on ANS launch cover | |
1A Swanson-design satellite with radial antennas like those on ESRO-2A is available in black, blue, cyan, green, magenta, purple, and red.
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