Sheets of North Korea, 1981 incomplete
| Issuer | Date | Desc | State | ||
| - | no image | North Korea | 1/30/1981 | empty sheet (#44969) | incomplete |
| - | no image | North Korea | 1/30/1981 | empty sheet (#44970) | incomplete |
| - | no image | North Korea | 2/20/1981 | empty sheet (#44971) | incomplete |
| - | no image | North Korea | 2/20/1981 | empty sheet (#44972) | incomplete |
| - |  |
North Korea | 2/28/1981 | empty sheet (#19537) | incomplete |
| - | no image | North Korea | 2/28/1981 | empty sheet (#44973) | incomplete |
| - | no image | North Korea | 2/28/1981 | empty sheet (#44974) | incomplete |
| - | no image | North Korea | 3/17/1981 | empty sheet (#44975) | incomplete |
| - | no image | North Korea | 3/17/1981 | empty sheet (#44976) | incomplete |
| - | no image | North Korea | 3/20/1981 | empty sheet (#44977) | incomplete |
| - | no image | North Korea | 3/20/1981 | empty sheet (#44978) | incomplete |
| - | no image | North Korea | 3/27/1981 | empty sheet (#44979) | incomplete |
| - | no image | North Korea | 4/10/1981 | empty sheet (#44980) | incomplete |
| - | no image | North Korea | 5/20/1981 | empty sheet (#44981) | incomplete |
| - | no image | North Korea | 5/22/1981 | empty sheet (#44982) | incomplete |
| - | no image | North Korea | 5/25/1981 | empty sheet (#44983) | incomplete |
| - | no image | North Korea | 5/25/1981 | empty sheet (#44984) | incomplete |
| - | no image | North Korea | 7/20/1981 | empty sheet (#44985) | incomplete |
| - | no image | North Korea | 7/20/1981 | empty sheet (#44986) | incomplete |
| - | no image | North Korea | 7/25/1981 | empty sheet (#44987) | incomplete |
| - | no image | North Korea | 9/18/1981 | empty sheet (#44988) | incomplete |
| - | no image | North Korea | 9/20/1981 | empty sheet (#44989) | incomplete |
| - | no image | North Korea | 9/29/1981 | empty sheet (#44990) | incomplete |
| - | no image | North Korea | 9/29/1981 | empty sheet (#44991) | incomplete |
| - |  |
North Korea | 10/9/1981 | empty sheet (#19532) | incomplete |
| - |  |
North Korea | 10/9/1981 | empty sheet (#19533) | incomplete |
| - |  |
North Korea | 10/9/1981 | empty sheet (#19534) | incomplete |
| - | no image | North Korea | 10/9/1981 | empty sheet (#44992) | incomplete |
| - |  |
North Korea | 11/14/1981 | empty sheet (#19535) | incomplete |
| - | no image | North Korea | 12/1/1981 | empty sheet (#19536) | incomplete |