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

Soviet Union 1923-91

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Start price: $50

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1930, Educational Exhibition, 10k olive green, two blocks of four on creamy or white paper, last one with bottom sheet margin, full OG, NH, VF, C.v. $134++, Est. $75-$80, Scott #435 var