| Issuer | Date | Desc | State | ||
| - | no image | Panama | 1/10/1968 | empty sheet (#28194) | incomplete |
| - | no image | Panama | 1/10/1968 | empty sheet (#28195) | incomplete |
| - | no image | Panama | 1/10/1968 | empty sheet (#28196) | incomplete |
| - | no image | Panama | 1/10/1968 | empty sheet (#28197) | incomplete |
| - | no image | Panama | 1/20/1968 | empty sheet (#28198) | incomplete |
| - | no image | Panama | 2/2/1968 | empty sheet (#28199) | incomplete |
| - | no image | Panama | 2/2/1968 | empty sheet (#28200) | incomplete |
| - | no image | Panama | 9/11/1968 | empty sheet (#28201) | incomplete |
| - | no image | Panama | 10/18/1968 | empty sheet (#28202) | incomplete |
| - | no image | Panama | 10/22/1968 | empty sheet (#28203) | incomplete |
| - | no image | Panama | 10/29/1968 | empty sheet (#28204) | incomplete |
| - | no image | Panama | 12/18/1968 | empty sheet (#28205) | incomplete |