Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 408:
1931, Trans-Atlantic Flight Routes, $1 blue, vertical imperforate pair, enlarged margins and strong color, full OG, NH, VF and rare, C.v. $1,100, Unitrade C.v. CAD $1,500, Est. $500-$600, Scott #C8c
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