Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

Worldwide Air Post Stamps and Postal History - Soviet Union

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Start price: $200

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1934, the Stratosphere Disaster, 5k, 10k and 20k, used on individual covers together with other values, first one sent in Moscow, the other one – from Kiev to Moscow, the last one – from Moscow to Leningrad, all appropriate markings, mostly VF, Est. $300-$400, Sc. #C50-52