| Explorer-1
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| Explorer-1
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Below is a checklist of Explorer-1 satellite postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). Catalog numbers, years of issue, and notes on the satellites featured are given when available. The remainder of the Explorer-series satellites are covered separately. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.
Farther below is a list of Explorer-1 launch covers, anniversary-of-launch covers, and launch-related event covers.
For Explorer-1 launch information see the Explorer-series table on the scientific/research satellites page.
| Country | Catalog Number* | Type of Item** | Year of Issue | Notes on Content |
|---|---|---|---|---|
| Explorer-1 | ||||
| Ajman | Mi257 | 1968 | ||
| Antigua and Barbuda | 2360b | One of MS6 (2360 (a-f)) | 2000 | |
| Batum | Local_e | One of MS6 (a-f), also imperforate MS6 (a-f) | 1997 | |
| Batum | Local_e_op | One of MS6 (a-f) overprinted in gold | 1998 | |
| Bolivia | BL130 | In (lower) margin of imperforate SS1 | 1982 | |
| Burkina Faso | 1168f | One of MS6 (1168 (a-f)) | 2000 | |
| Cuba | 2136 | Stamp-on-stamp: Yugoslavia 870 | 1977 | |
| Djibouti | C189 (Mi379) | 1983 | ||
| Djibouti | C189a (BL89A) iC189a (BL89B) | SS1 (C189) | ||
| Grenada Carriacou | 2126b | One of MS6 (2126 (a-f)) | 1999 | |
| Guyana | 2106b | One of MS25 (2106 (a-y)), 280 overprinted in gold | 1989 | Explorer-1 name |
| Guyana | 2106b specimen | One of MS25 (2106 specimen (a-y)), 280 overprinted in gold | ||
| Guyana | 2107b | One of MS25 (2107 (a-y)), 280 overprinted in silver | ||
| Guyana | 2107b specimen | One of MS25 (2107 specimen (a-y)), 280 overprinted in silver | ||
| Hungary | CB30b | In (upper-left) margin of MS4 (CB27-CB30) | 1967 | Poorly-depicted Explorer-1 |
| Macedonia | Unknown (new issue) | 2008 | ||
| Malawi | Unknown fdc (new issue) | Cachet on FDC | 2007 | |
| Maldive Islands | Unknown ms4 (new issue) | On stamps and in (right) margin of MS4 | 2008 | |
| Manama | Mi87A Mi87B | 1968 | ||
| Marshall Islands | 345c | One of MS25 (345 (a-y)) | 1989 | Explorer-1 launch |
| Marshall Islands | KM51 | $50. (coin) | 1989 | |
| Micronesia | 81b (Mi133) | One of MS9 (81 (a-i)) | 1989 | Explorer-1 launch |
| Micronesia | 344a (Mi721) | One of MS20 (344 (a-t)) and on selvedge | 1999 | |
| Montserrat | 1200 | MS4 | 2008 | |
| Montserrat | 1200 fdc | MS4 and cachet on FDC | ||
| Montserrat | 1201 | SS1 | ||
| Montserrat | 1201 fdc | SS1 on FDC | ||
| Paraguay | C405 | SS1 | 1975 | |
| Poland | 1180 | 1963 | ||
| Poland | 2248a label | On one label of MS6 (2248a (6x 2248 + 2 labels)) | 1977 | |
| Poland | 2248 cancel | Cancel on FDC | 1977 | |
| Poland | None | Cancel | 1977 | |
| Romania | Unknown (new issue) | 2008 | ||
| Romania | Unknown maxi (new issue) | Maxicard | ||
| Romania | Unknown fdc (new issue) | Stamp and cachet on FDC | ||
| Romania | Unknown (new issue) | Aerogramme | ||
| St. Thomas and Prince Islands | Unknown (new issue) | In (upper-right) margin of SS1 | 2008 | |
| St. Thomas and Prince Islands | Unknown (new issue) | SS1 on FDC | ||
| St. Thomas and Prince Islands | Unknown (new issue) | Impeforate SS1 on FDC | ||
| St. Vincent | 2080f | One of MS9 (2080 (a-i)) | 1994 | |
| St. Vincent | 2080f specimen | One of MS9 (2080 specimen (a-i)) | ||
| St. Vincent | 2081f | One of MS9 (2081 (a-i)) | ||
| St. Vincent | 2081f specimen | One of MS9 (2081 specimen (a-i)) | ||
| St. Vincent | 2702a | One of MS9 (2702 (a-i)) | 1999 | |
| United States | 1107 fdc | Cachet on FDC | 1958 | |
| United States | None | Cancel on cover | 1983 | 25 years space exploration: Explorer-1 |
| United States | 3187d 3187d back | One of pane of 15 (3187 (a-o)) | 1999 | Explorer-1 launch |
| United States | 3187d fdc1 | Cachet on FDC | Explorer-1 launch | |
| United States | 3187d fdc2 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | 3187d fdc3 | Cachet (different) on FDC | ||
| United States | 3187d fdc4 | Cachet (different) on FDC | ||
| United States | 3187d fdc5 | Cachet (different) on FDC | ||
| United States | 3187d fdc6 | Cachet (different) on FDC | ||
| United States | 3187d fdc7 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | 3187d fdc8 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | 3187d fdc9 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | 3187d fdc10 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | 3187d fdc11 | Cachet (different) on FDC | ||
| United States | 3187d fdc12 | Cachet (different) on FDC | Explorer-1 launch | |
| United States | CP537F | Commemorative panel (3187) | 1999 | First U.S. artificial satellite launched (in text only) |
| United States | None | Cancel on Acrimsat launch cover | 1999 | |
| United States | None | Cancel on Jason-1 and TIMED launch cover | 2001 | |
| Yugoslavia | 870 (Mi1216) | 1967 | ||
*Scott catalog number, unless prefixed with Mi or BL for Michel; "i" prefix denotes imperforate version; KM = Krause and Mishler coin catalog number.
**FDC = first day cover; SS# = souvenir sheet, MS# = miniature sheet, where # = number of stamps in sheet, and the numbers in parentheses are the catalog numbers of the stamps in the sheet.
Below is a list of Explorer-1 launch covers, anniversary-of-launch covers, and launch-related event covers.
| Country | Cancel Date | Cancel Location | Type of Item | Notes on Content |
|---|---|---|---|---|
| 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 | (?) cachet on cover | Explorer-1 launch |
| United States | 1970-03-31 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover | Explorer-1 re-entry |
| United States | 1970-03-31 | Houston TX | (MSCS) cachet on cover | Explorer-1 re-entry |
| United States | 1973-01-31 | Redstone Arsenal AL | (Smithsonian no.3) cachet on cover | 15th anniv. Explorer-1 launch |
| United States | 1983-01-31 | Pasadena CA | (JPL) cachet on cover | 25th anniv. Explorer-1 launch |
| United States | 1983-01-31 | Cape Canaveral FL | (?) cachet on cover | 25th anniv. Explorer-1 launch |
| United States | 1988-04-30? | Huntsville AL | (?) cachet on cover | 30th anniv. Explorer-1 launch |
| United States | 2008-01-31 | Cape Canaveral FL | (?) cachet on cover | 50th anniv. Explorer-1 launch |
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