USSR
Acknowledged, but not listed by SG.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | Antarctic Drift of Mikhail Somov |
| Nominal: | 60 k |
| Year: | 1986 |
| Material: | coated |
| Perforation: | frame 11½ |
| Mintage: | 15,000 |
Antarctic Drift of Mikhail Somov
 Antarctic Drift of "Mikhail Somov" |  Antarctic Drift of "Mikhail Somov" 1.3$ |