Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1941-91

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Start price: $400

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1961, 22nd Congress of Communist Party, Worker and the Globe, 4k red and black brown, perforation L12½ instead of comb 12½x12, full OG, NH, VF, V. Liapine certificate, Est. $600-$800 , Sc. #2528 var