Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 427:
1990, Pronghorn, 45c multicolored, left sheet margin imperforate block of four, full OG, NH, VF, C.v. $1,500, Unitrade C.v. CAD$2,400 as two pairs, Scott #1172h
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