| Issuer | Date | Desc | State | ||
| - | no image | Tuvalu | 2/2/1998 | empty sheet (#26631) | incomplete |
| - | no image | Tuvalu | 3/31/1998 | empty sheet (#26632) | incomplete |
| - | no image | Tuvalu | 4/1/1998 | 80th Anniversary of the Royal Air Force, sheet of 4 types | |
| - | no image | Tuvalu | 10/1/1998 | empty sheet (#26634) | incomplete |
| - | no image | Tuvalu | 11/6/1998 | empty sheet (#26635) | incomplete |