3rd All-Union Philatelic Society Congress, Moscow
50 k 1974
USSR
3.2 - 3.8$
price on 26.02.2023
Unique serial number at bottom centre.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | 3rd All-Union Philatelic Society Congress, Moscow |
| Nominal: | 50 k |
| Year: | 1974 |
| Material: | coated |
| Size: | 110 x 70 mm |
| Perforation: | frame 12 x 12½ |
| Mintage: | 400,000 |