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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1976, 25th Congress of the Communist Party, ”Industry”, 4k multicolored, right sheet margin imperforated single, full OG, NH, VF, Est. $700-$800 , Sc. #4476 imp