Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1924-40

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Start price: $50

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1937, Architectural Projects, 40k violet, souvenir sheet of four, 5 examples, post office fresh quality with original protective sheets (enclosed), full OG, NH, VF, C.v. $275 , Sc. #603a