| Issuer | Date | Desc | State | ||
| - | no image | Tuvalu | 2/16/1999 | empty sheet (#26636) | incomplete |
| - | no image | Tuvalu | 3/19/1999 | empty sheet (#26637) | incomplete |
| - | no image | Tuvalu | 7/20/1999 | empty sheet (#26638) | incomplete |
| - | no image | Tuvalu | 8/16/1999 | empty sheet (#26639) | incomplete |
| - | no image | Tuvalu | 11/22/1999 | Tuvalu Flowers 1999, sheet of 6 types | incomplete |
| - | no image | Tuvalu | 11/22/1999 | Tuvalu Flowers 1999, sheet of 6 types | |
| - | no image | Tuvalu | 11/22/1999 | Tuvalu Flowers 1999, sheet of 1 type | |
| - | no image | Tuvalu | 12/31/1999 | New Millennium, sheet of 6 types | |
| - | no image | Tuvalu | 12/31/1999 | New Millennium, sheet of 1 type |