| Issuer | Date | Desc | State | ||
| - | no image | Comoro Islands | 7/21/1975 | empty sheet (#43447) | incomplete |
| - | no image | Comoro Islands | 12/15/1975 | Apollo-Soyuz, empty sheet (#43448) | incomplete |
| - | no image | Comoro Islands | 12/15/1975 | Apollo-Soyuz, empty sheet (#43449) | incomplete |
| - | no image | Comoro Islands | 12/15/1975 | Apollo-Soyuz, sheet of 1 type |