Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 219:
1991, Kestrel, imperforate proof of 1c multicolored, left sheet margin horizontal gutter block of four, full OG, NH, VF, C.v. $400 as two gutter pairs, Est. $200-$250, Scott #2476 P
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