Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

United States - Modern Errors

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Start price: $250

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1983, Science and Industry, (20c) multicolored, bottom sheet margin vertical pair, top stamp has black (engraved) color completely omitted, while bottom one has just shifted traces of black, full OG, NH, VF and rare in such form, C.v. $750++, Est. $400-$500, Sc. #2031, a