Sheets of Singapore, 1998
| Issuer | Date | Desc | State | ||
| - | no image | Singapore | 5/13/1998 | empty sheet (#22014) | incomplete |
| - | no image | Singapore | 7/23/1998 | empty sheet (#22015) | incomplete |
| - |  |
Singapore | 8/6/1998 | empty sheet (#22016) | incomplete |
| - |  |
Singapore | 9/9/1998 | Flowers of the Garden Parks of Singapore, sheet of 8 types | incomplete |
| - | no image | Singapore | 10/23/1998 | empty sheet (#22018) | incomplete |