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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1939, definitive issue, miner 5k red, perforation L12½ instead of comb 11¾x12¼, unfolded block of six (2×3), full OG, NH, VF,Scott #734 var