USSR
3.2 - 3.8$
price on 16.10.2022
Unique serial number at bottom centre.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | 20th Anniversary of Space Exploration |
| Nominal: | 50 k |
| Year: | 1977 |
| Material: | coated |
| Size: | 65 x 85 mm |
| Perforation: | frame 11½ x 12 |
| Mintage: | 500,000 |