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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1930, two color postcards (MS ”Europa”) sent by registered mail from Leningrad to Hamburg, each one franked by perforated complete set of the Revolution of 1905 on address part and Child Welfare set of two of 1929 or 1930 respectively on picture side, appropriate markings, one with Hamburg arrival ds, VF, Est. $150-$200, Sc. #438-40, B54-57