| Issuer | Date | Desc | State | ||
| - | no image | Liberia | 5/19/1961 | empty sheet (#34182) | incomplete |
| - | no image | Liberia | 9/8/1961 | empty sheet (#34183) | incomplete |
| - | no image | Liberia | 10/25/1961 | empty sheet (#34184) | incomplete |
| - | no image | Liberia | 12/4/1961 | empty sheet (#34185) | incomplete |