Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 407:
1931, Airplane over Packet Ship, 50c green, vertical imperforate pair, nice margins and post office fresh, full OG, NH, VF and rare, C.v. $1,100, Unitrade C.v. CAD$1,800, Est. $500-$600, Scott #C7c
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