Sheets of Estonia, 2004
| Issuer | Date | Desc | State | ||
| - |  |
Estonia | 2/18/2004 | Hioma sailing around Cape Horn 150th, sheet of 1 type | incomplete |
| - |  |
Estonia | 3/17/2004 | empty sheet (#4252) | incomplete |
| - |  |
Estonia | 3/17/2004 | empty sheet (#4256) | incomplete |
| - |  |
Estonia | 5/1/2004 | European Union admission, sheet of 1 type | incomplete |
| - |  |
Estonia | 5/4/2004 | Europa 2004, sheet of 1 type | incomplete |
| - |  |
Estonia | 6/28/2004 | NATO admission, sheet of 1 type | incomplete |