USSR
0.05 - 0.06$
price on 24.02.2023
Exists on both ordinary and UV reactive paper.
| Country: | USSR |
| Type: | Postage stamps |
| Series: | World Fair EXPO-67, Montreal |
| Nominal: | 6 k |
| Year: | 1967 |
| Size: | 30 x 42 mm |
| Perforation: | comb 12 x 12½ |
| Mintage: | 4,000,000 |
World Fair EXPO-67, Montreal
 Sea-water Distilling Apparatus 0.05$ |  Image of Atom 0.05$ |  "Proton 1" Satellite 0.42$ |