| Issuer | Date | Desc | State | ||
| - | no image | Micronesia | 1/15/1991 | New Capital, Palikir Valley, Pohnpei, sheet of 2 types | all added |
| - | no image | Micronesia | 1/15/1991 | New Capital, Palikir Valley, Pohnpei, sheet of 1 type | all added |
| - | no image | Micronesia | 7/30/1991 | Operation Desert Shield and Desert Storm, Liberation of Kuwait, sheet of 1 type | all added |
| - | no image | Micronesia | 10/18/1991 | PHILANIPPON '91, sheet of 3 types | all added |
| - | no image | Micronesia | 10/18/1991 | PHILANIPPON '91, sheet of 3 types | |
| - | no image | Micronesia | 10/18/1991 | PHILANIPPON '91, sheet of 1 type | all added |
| - | no image | Micronesia | 11/18/1991 | empty sheet (#85257) | incomplete |