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U.S. Notes, by John HotchnerYou can click on a page to see an even larger copy.
Keywords: stamp errors, Hotchner, extra perforations, line perforations, harrow perforations, line perforators, harrow perforating, Great Americans definitive stamps, bull's eye perforating, 1992 Linn's U.S. Stamp Yearbook, Ashton-Potter, Amerst, NY, stroke comb perforator, www.unicover.com, The Inside Story of the Wildflowers of the 50 States, Bickel perforators, mechanical cog system, doublepro, Wista perforators
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