| Issuer | Date | Desc | State | ||
| - | no image | Nicaragua | 4/30/1974 | empty sheet (#85939) | incomplete |
| - | no image | Nicaragua | 4/30/1974 | empty sheet (#85940) | incomplete |
| - | no image | Nicaragua | 5/8/1974 | empty sheet (#85941) | incomplete |
| - | no image | Nicaragua | 5/8/1974 | empty sheet (#85942) | incomplete |
| - | no image | Nicaragua | 7/10/1974 | 100th Anniversary of the Universal Postal Union, empty sheet (#28034) | incomplete |