Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1012:
1978, Wright Brothers, 31c multicolored, two blocks of four, containing two vertical se-tenant pairs, first one has all offset colors strongly shifted to the top, the other one has practically missing offset colors, full OG, NH, VF, Est. $200-$250, Scott #C92a var
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