USSR
3.7 - 4.4$
price on 21.02.2023
Unique serial number at bottom right.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | Centenary of Universal Postal Union (U.P.U.) |
| Nominal: | 1 ₽ |
| Year: | 1974 |
| Material: | coated |
| Size: | 120 x 75 mm |
| Perforation: | frame 12 x 12½ |
| Mintage: | 400,000 |