| Issuer | Date | Desc | State | ||
| - | no image | Isle of Man | 1/9/1991 | empty sheet (#60998) | incomplete |
| - | no image | Isle of Man | 5/30/1991 | 80th Anniversary of the Isle of Man TT Mountain Course, sheet of 5 types | |
| - | no image | Isle of Man | 7/1/1991 | empty sheet (#61000) | incomplete |