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: $1,000

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1976, Clara Maass, 13c multicolored, top right corner sheet margin plate No. block of 12 (6×2), horizontal perforation is strongly shifted to the top, resulting in upper stamps have dark blue color missing and plate Nos’ at top, while lower ones have dark blue at top instead of bottom, NH, VF and very rare multiple, C.v. $4,200 as singles, Est. $1,500-$2,000, Sc. #1699, b