Sheets of Mongolia, 1977
| Issuer | Date | Desc | State | ||
| - |  |
Mongolia | 3/31/1977 | empty sheet (#16810) | incomplete |
| - |  |
Mongolia | 5/20/1977 | empty sheet (#16811) | incomplete |
| - |  |
Mongolia | 6/1/1977 | empty sheet (#16812) | incomplete |
| - |  |
Mongolia | 6/20/1977 | empty sheet (#16813) | incomplete |
| - |  |
Mongolia | 12/5/1977 | empty sheet (#16814) | incomplete |
| - |  |
Mongolia | 12/20/1977 | empty sheet (#16815) | incomplete |