| Issuer | Date | Desc | State | ||
| - | no image | Panama | 2/17/1964 | empty sheet (#28160) | incomplete |
| - | no image | Panama | 9/28/1964 | empty sheet (#28161) | incomplete |
| - | no image | Panama | 10/9/1964 | empty sheet (#28162) | incomplete |
| - | no image | Panama | 10/24/1964 | empty sheet (#28163) | incomplete |
| - | no image | Panama | 10/24/1964 | empty sheet (#28164) | incomplete |
| - | no image | Panama | 12/1/1964 | empty sheet (#28165) | incomplete |