Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-40

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Start price: $100

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1937, Felix Dzerzhinsky, 10k yellow brown, complete sheet of 50 (10×5), folded once between 5th and 6th vertical rows, full OG, NH, VF, C.v. $300++, Scott #66