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

Soviet Union 1941-91

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Start price: $100

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1955, Moscow University, 40k multicolored, perforation L12 1/2 instead of comb 12 1/2×12, right sheet margin block of six (2×3), full OG, NH, VF, each stamp with Soviet Philatelic guarantee hs on reverse, Scott #1786 var