| Issuer | Date | Desc | State | ||
| - | no image | Sierra Leone | 4/8/1991 | empty sheet (#37193) | incomplete |
| - | no image | Sierra Leone | 4/8/1991 | empty sheet (#37194) | incomplete |
| - | no image | Sierra Leone | 5/13/1991 | empty sheet (#37195) | incomplete |
| - | no image | Sierra Leone | 5/13/1991 | empty sheet (#37196) | incomplete |
| - | no image | Sierra Leone | 5/13/1991 | empty sheet (#37197) | incomplete |
| - | no image | Sierra Leone | 5/13/1991 | empty sheet (#37198) | incomplete |
| - | no image | Sierra Leone | 6/3/1991 | empty sheet (#37199) | incomplete |
| - | no image | Sierra Leone | 6/3/1991 | empty sheet (#37200) | incomplete |
| - | no image | Sierra Leone | 7/5/1991 | empty sheet (#37201) | incomplete |
| - | no image | Sierra Leone | 7/5/1991 | empty sheet (#37202) | incomplete |
| - | no image | Sierra Leone | 8/5/1991 | sheet of 1 type | |
| - | no image | Sierra Leone | 8/5/1991 | sheet of 1 type | |
| - | no image | Sierra Leone | 8/5/1991 | sheet of 1 type | |
| - | no image | Sierra Leone | 8/5/1991 | sheet of 1 type | |
| - | no image | Sierra Leone | 10/14/1991 | empty sheet (#37207) | incomplete |
| - | no image | Sierra Leone | 10/14/1991 | empty sheet (#37208) | incomplete |
| - | no image | Sierra Leone | 10/14/1991 | empty sheet (#37209) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37210) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37211) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37212) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37213) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37214) | incomplete |
| - | no image | Sierra Leone | 10/28/1991 | empty sheet (#37215) | incomplete |
| - | no image | Sierra Leone | 12/9/1991 | empty sheet (#37216) | incomplete |
| - | no image | Sierra Leone | 12/9/1991 | empty sheet (#37217) | incomplete |
| - | no image | Sierra Leone | 12/20/1991 | empty sheet (#37218) | incomplete |
| - | no image | Sierra Leone | 12/20/1991 | empty sheet (#37219) | incomplete |
| - | no image | Sierra Leone | 12/20/1991 | empty sheet (#37220) | incomplete |
| - | no image | Sierra Leone | 12/24/1991 | empty sheet (#37221) | incomplete |
| - | no image | Sierra Leone | 12/24/1991 | empty sheet (#37222) | incomplete |
| - | no image | Sierra Leone | 12/24/1991 | empty sheet (#37223) | incomplete |