Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3

Soviet Union

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Start price: $100

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1937, definitive issue, farm worked 4k claret, printed on paper without watermark, left sheet margin unfolded block of four, full original gum with usual waves, NH, VF, C.v. $500++, Est. $150-$200, Sc. # 615