| Issuer | Date | Desc | State | ||
| - | no image | Uruguay | 5/28/1999 | empty sheet (#25612) | incomplete |
| - | no image | Uruguay | 7/30/1999 | sheet of 4 types | |
| - | no image | Uruguay | 10/22/1999 | 70th Anniversary of SODRE, sheet of 4 types | |
| - | no image | Uruguay | 10/22/1999 | 70th Anniversary of SODRE, sheet of 4 types |