Sheets of Bulgaria, 1973
| Issuer | Date | Desc | State | ||
| - |  |
Bulgaria | 1/24/1973 | Undersea research in the Black Sea, sheet of 4 types | |
| - |  |
Bulgaria | 4/3/1973 | Flight Tourism, empty sheet (#5926) | incomplete |
| - |  |
Bulgaria | 5/4/1973 | IBRA '73, empty sheet (#5933) | incomplete |
| - |  |
Bulgaria | 5/4/1973 | IBRA '73, empty sheet (#5934) | incomplete |
| - |  |
Bulgaria | 8/29/1973 | Olympic Congress, empty sheet (#5928) | incomplete |
| - |  |
Bulgaria | 8/29/1973 | Olympic Congress, empty sheet (#5929) | incomplete |
| - |  |
Bulgaria | 8/31/1973 | Olympic Congress, empty sheet (#5927) | incomplete |
| - |  |
Bulgaria | 9/27/1973 | empty sheet (#5930) | incomplete |
| - |  |
Bulgaria | 11/10/1973 | sheet of 2 types | |
| - |  |
Bulgaria | 12/12/1973 | World Cup 1974 in 1973, sheet of 1 type |