| Issuer | Date | Desc | State | ||
| - | no image | Guinea | 3/14/1966 | empty sheet (#29477) | incomplete |
| - | no image | Guinea | 3/14/1966 | empty sheet (#29478) | incomplete |
| - | no image | Guinea | 6/10/1966 | Luna 9, empty sheet (#29479) | incomplete |
| - | no image | Guinea | 6/10/1966 | empty sheet (#29480) | incomplete |