Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1924-40

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