Sheets of United States, 1973
| Issuer | Date | Desc | State | ||
| - |  |
United States | 1973 | empty sheet (#233) | incomplete |
| - |  |
United States | 1973 | empty sheet (#234) | incomplete |
| - |  |
United States | 1973 | empty sheet (#235) | incomplete |
| - |  |
United States | 1973 | empty sheet (#236) | incomplete |