| Issuer | Date | Desc | State | ||
| - | no image | Gabon | 1998 | empty sheet (#21898) | incomplete |
| - | no image | Gabon | 2/10/1998 | empty sheet (#21899) | incomplete |
| - | no image | Gabon | 2/10/1998 | empty sheet (#21900) | incomplete |
| - | no image | Gabon | 7/10/1998 | empty sheet (#21901) | incomplete |