| Issuer | Date | Desc | State | ||
| - | |
Bulgaria | 3/22/2000 | empty sheet (#6297) | incomplete |
| - | |
Bulgaria | 5/23/2000 | empty sheet (#6298) | incomplete |
| - | no image | Bulgaria | 7/19/2000 | empty sheet (#6299) | incomplete |
| - | no image | Bulgaria | 11/28/2000 | empty sheet (#6300) | incomplete |