Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 125:
1937, Aviation Exhibition, Twin-Motored Airplane, 50k dark violet and black, vertical pair imperforate between stamps, neatly cancelled, VF and rare, C.v. $4,500, Est. $1500-$2,000, Scott #C73a
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