Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1937, Airplanes, 40k violet brown and black, vertical pair imperforate between stamps, full OG, NH, VF and rare, Soviet Philatelic guarantee on reverse, C.v. $5,000, Est. $2,500-$3,000 , Scott #C72a