Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 18:
1978, Wright Brothers, 31c multicolored, two blocks of four, each one containing two vertical se-tenant pairs, first one with practically omitted offset colors, while other one has all offset colors strongly shifted to the top, full OG, NH, VF,Scott #C92a var
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