Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1937, two registered covers from Leningrad and Moscow to USA sent in 1938, franked by Airplanes stamps of 50k and 80k or souvenir sheet of 1r x4, all appropriate markings and arrival ds, F/VF, both arranged on pages from a Collection, Est. $250-$300, Scott #C73-74, C75a