Sheets of Cook Islands, 1981
| Issuer | Date | Desc | State | ||
| - |  |
Cook Islands | 4/10/1981 | empty sheet (#19122) | incomplete |
| - |  |
Cook Islands | 7/29/1981 | empty sheet (#19123) | incomplete |
| - | no image | Cook Islands | 10/10/1981 | empty sheet (#75770) | incomplete |
| - | no image | Cook Islands | 12/14/1981 | empty sheet (#75771) | incomplete |
| - | no image | Cook Islands | 12/14/1981 | empty sheet (#75772) | incomplete |
| - | no image | Cook Islands | 12/14/1981 | empty sheet (#75773) | incomplete |
| - | no image | Cook Islands | 12/14/1981 | empty sheet (#75774) | incomplete |
| - | no image | Cook Islands | 12/14/1981 | empty sheet (#75775) | incomplete |