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: $75

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1938, Moscow Subway, 10k-50k, complete set of six, stamp of 40k with right sheet margin and double perforation between stamp and selvage, full OG, NH, VF, C.v. $155++ , Sc. #687-92