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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1936, Pioneers Helping Post, 1k-15k, two complete set of six with perforation 14 and 11, additional two stamps of 2k (both perf) on porous (”cotton”) paper and 1k (perf 14) with partial print on margin, all with full OG, NH, VF, C.v. $263++, Scott #583-88, a, var