Sheets of Czechoslovakia, 1981
| Issuer | Date | Desc | State | ||
| - |  |
Czechoslovakia | 4/5/1981 | 20th Anniversary of First Manned Space Flight, sheet of 2, 1 type | all added |
| - |  |
Czechoslovakia | 5/10/1981 | empty sheet (#3977) | incomplete |
| - |  |
Czechoslovakia | 7/2/1981 | empty sheet (#3978) | incomplete |