Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 497:
1989, Flag over the Clouds, 39c multicolored, right sheet margin imperforate block of four, full OG, NH, VF, C.v. $1,050++, Unitrade C.v. CAD$1,400, Est. $300-$350, Scott #1166d
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