| Issuer | Date | Desc | State | ||
| - | no image | GuineaBissau | 1988 | FINLANDIA '88, sheet of 1 type | |
| - | no image | GuineaBissau | 1/15/1988 | empty sheet (#65890) | incomplete |
| - | no image | GuineaBissau | 2/26/1988 | empty sheet (#65891) | incomplete |
| - | no image | GuineaBissau | 4/14/1988 | ESSEN '88, empty sheet (#65881) | incomplete |
| - | no image | GuineaBissau | 9/29/1988 | Dogs 1988, sheet of 1 type |