USSR
0.13 - 0.16$
price on 16.10.2022
Exists on both ordinary and UV reactive paper.
| Country: | USSR |
| Type: | Postage stamps |
| Series: | 50 Years of Soviet Inventions |
| Nominal: | 4 k |
| Year: | 1969 |
| Size: | 28 x 40 mm |
| Perforation: | comb 11½ |
| Mintage: | 5,000,000 |