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: $300

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1941, Nikolay Zhukovsky, Russian Scientist, 50k brown lilac, error stamp printed on horizontally laid paper, full OG, NH, VF and scarce, Est. $500-$600 , Sc. #840 var