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

Soviet Union of 1941-91

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Start price: $1,200

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1957, 40th Anniversary of the October Revolution, proof souvenir sheet of three stamps 40k, printed on thick paper without lilac color (silhouettes of Leningrad), enlarged size 149x106mm, no gum as produced, NH, VF and scarce, a common CTO sheet is enclosed for comparison, Est. $2,500-$3,000, Scott #1943a