Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 69:
Description
1937, Airplanes, 50k dark violet and black, vertical pair imperforate between stamps, CTO with full OG (NH), VF and rare, this error exists only used, C.v. $4,500, Est. $2,000-$2,500 , Scott #C73a
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