USSR
Acknowledged, but not listed by SG.
| Country: | USSR |
| Type: | Postal blocks |
| Series: | 50th Anniversary of Chelyuskin's Voyage. |
| Nominal: | 8*6 k |
| Year: | 1984 |
| Material: | coated |
| Perforation: | frame 11½ x 12 |
| Mintage: | 15,000 |
50th Anniversary of Chelyuskin's Voyage.
 Research Ship "Chelyuskin" and Route |  Evacuation of Sinking Ship |  Rescue of the Crew |