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: $100

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1932, Moscow Philatelic Exhibition, 15k black brown and 35k ultra used on cover from Moscow to Leningrad, tied by special Exhibition postmark in red, arrival ds on reverse, VF, Est. $150-$200 , Sc. #485-86