USSR
0.73 - 0.88$
price on 16.10.2022
Unique serial number at bottom centre.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | Preserve Nature and the World |
| Nominal: | 50 k |
| Year: | 1983 |
| Material: | coated |
| Size: | 82 x 65 mm |
| Perforation: | frame 11½ |
| Mintage: | 700,000 |