| Issuer | Date | Desc | State | ||
| - | no image | Guinea | 4/16/1988 | empty sheet (#29557) | incomplete |
| - | no image | Guinea | 7/5/1988 | Scouts, Birds and Butterflies, sheet of 1 type | |
| - | no image | Guinea | 7/5/1988 | empty sheet (#29559) | incomplete |
| - | no image | Guinea | 10/2/1988 | empty sheet (#29560) | incomplete |