Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - 1938, 2nd Trans-Polar Flight, 20k gray black, imperforated single with enlarged margin at bottom and nice margins at other sides, typical gum wrinkles, full OG, NH, VF, C.v. $950, Est. $400-$500 , Sc. #641a