| Issuer: Mongolia
Date: 12/20/1977 (1977 sheets) INCOMPLETE Block 1 (0, 0 x 0) |
Prev: Mongolia 1977 empty sheet (#16814)
Next: Mongolia 75th Anniversary of Powered Flight, empty sheet (#16816) External links: Colnect 248669..ry_of_Airships |
| Issuer: Mongolia
Date: 12/20/1977 (1977 sheets) INCOMPLETE Block 1 (0, 0 x 0) |
Prev: Mongolia 1977 empty sheet (#16814)
Next: Mongolia 75th Anniversary of Powered Flight, empty sheet (#16816) External links: Colnect 248669..ry_of_Airships |
