History of Aviation, Rare Stamps and Postal History of the World, Part 3

Soviet Union

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Start price: $1,000

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1965, Cosmonauts’ Day, 10k multicolored, transition sheet of 30 (6×5) includes at least 20 stamps with double impression of gold color, unfolded and post office fresh, full OG, NH, VF and very rare, only 5 such sheets were found, no more then 3 remain unbroken, Est. $1,500-$2,000, Sc. #3193, var