Sheets of North Korea, 1991 incomplete
| Issuer | Date | Desc | State | ||
| - |  |
North Korea | 1/10/1991 | empty sheet (#19642) | incomplete |
| - | no image | North Korea | 1/10/1991 | empty sheet (#51649) | incomplete |
| - | no image | North Korea | 1/10/1991 | empty sheet (#51650) | incomplete |
| - |  |
North Korea | 2/5/1991 | empty sheet (#19635) | incomplete |
| - | no image | North Korea | 2/20/1991 | empty sheet (#51651) | incomplete |
| - | no image | North Korea | 2/26/1991 | empty sheet (#51652) | incomplete |
| - | no image | North Korea | 3/27/1991 | empty sheet (#51653) | incomplete |
| - |  |
North Korea | 4/20/1991 | empty sheet (#19636) | incomplete |
| - |  |
North Korea | 4/20/1991 | empty sheet (#19638) | incomplete |
| - | no image | North Korea | 4/20/1991 | empty sheet (#51654) | incomplete |
| - | no image | North Korea | 4/20/1991 | empty sheet (#51655) | incomplete |
| - |  |
North Korea | 6/18/1991 | empty sheet (#19637) | incomplete |
| - |  |
North Korea | 6/18/1991 | empty sheet (#19639) | incomplete |
| - | no image | North Korea | 6/18/1991 | empty sheet (#51656) | incomplete |
| - | no image | North Korea | 6/18/1991 | empty sheet (#51657) | incomplete |
| - | no image | North Korea | 6/18/1991 | empty sheet (#51658) | incomplete |
| - |  |
North Korea | 8/27/1991 | empty sheet (#19640) | incomplete |
| - | no image | North Korea | 9/2/1991 | empty sheet (#51659) | incomplete |
| - |  |
North Korea | 9/20/1991 | empty sheet (#19641) | incomplete |
| - | no image | North Korea | 9/20/1991 | empty sheet (#51660) | incomplete |
| - | no image | North Korea | 9/20/1991 | empty sheet (#51661) | incomplete |
| - | no image | North Korea | 10/16/1991 | empty sheet (#51662) | incomplete |
| - | no image | North Korea | 11/3/1991 | empty sheet (#51663) | incomplete |