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

Soviet Union 1941-91

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Start price: $400

Buyer's premium:

1983, Academician Aleksandr Sidorenko, 4k multicolored, left sheet margin horizontal imperforate pair, full OG, NH, VF, Est. $800-$1,000, Scott #5196 imp