| Issuer | Date | Desc | State | ||
| - | no image | Panama | 4/4/1966 | empty sheet (#28177) | incomplete |
| - | no image | Panama | 5/26/1966 | empty sheet (#28178) | incomplete |
| - | no image | Panama | 5/26/1966 | empty sheet (#28179) | incomplete |
| - | no image | Panama | 7/11/1966 | empty sheet (#28180) | incomplete |
| - | no image | Panama | 7/11/1966 | empty sheet (#28181) | incomplete |
| - | no image | Panama | 8/12/1966 | empty sheet (#28182) | incomplete |
| - | no image | Panama | 9/28/1966 | empty sheet (#28183) | incomplete |
| - | no image | Panama | 9/28/1966 | empty sheet (#28184) | incomplete |
| - | no image | Panama | 10/24/1966 | empty sheet (#28185) | incomplete |
| - | no image | Panama | 10/24/1966 | empty sheet (#28186) | incomplete |
| - | no image | Panama | 11/25/1966 | empty sheet (#28187) | incomplete |
| - | no image | Panama | 11/25/1966 | empty sheet (#28188) | incomplete |
| - | no image | Panama | 11/25/1966 | empty sheet (#28189) | incomplete |
| - | no image | Panama | 12/28/1966 | empty sheet (#28190) | incomplete |