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

Soviet Union of 1923-40

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Start price: $100

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1926, definitive issue, 1k-5r, imperforate complete set of 20, printed on watermarked paper, some with sheet margins, full OG, NH, mostly VF, Est. $200-$250,Scott #304-15, 317-25 imp