Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - 1931-32, Airships, 10k-1r, three complete sets of five, four and two, perforation L12¼ or comb 12½x12, 12x12½, 10½x12; in addition Airship over the Dnieper Dam 15k gray, engraved printing, two stamps with perforation 12½ or 14, all unit has full OG, NH, VF and scarce, C.v. $792, Scott #C20-24, a, C25, b