8th Congress for the Development of Mineral Resources, 1968
6 k 1968
USSR
0.28 - 0.34$
price on 16.10.2022
Exists on both ordinary and UV reactive paper.
| Country: | USSR |
| Type: | Postage stamps |
| Series: | International Congresses 1968 |
| Nominal: | 6 k |
| Year: | 1968 |
| Size: | 40 x 28 mm |
| Perforation: | comb 11½ |
| Mintage: | 4,000,000 |
