Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1247:
1987, Pan American Games, (22c) multicolored, top right corner sheet margin block of four with silver color omitted, usual centering, full OG, NH and rare positional piece, C.v. $2,200 as singles, Est. $800-$1,000, Scott #2247a
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