Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 6:
1978-80, Wright Brothers 31c, two blocks of four, each one is containing two vertical se-tenant pairs, first one has all offset colors strongly shifted, the other one with all offset colors almost missing, both with full OG, NH, VF, Est. $150-$180, Scott #C92 var
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