Sheets of Korea, 1991
| Issuer | Date | Desc | State | ||
| - | no image | Korea | 3/23/1991 | empty sheet (#24372) | incomplete |
| - |  |
Korea | 8/8/1991 | empty sheet (#24373) | incomplete |
| - | no image | Korea | 12/2/1991 | empty sheet (#24374) | incomplete |
| - | no image | Korea | 12/5/1991 | empty sheet (#24375) | incomplete |