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The Making of a 20th Century Collector.

>>  Catalogs and sources identtify the following number of errors of this stamps: Scott - 1, Michel - 4, Theo Henn in Die Danziger Briefmarken - 6, and Danzig Report No. 24 - 12, and John Plouffe - 13 and counting.

In order to keep things somewhat organized I've used the 12 errors listed in Danzig Report No. 24 as a starting place and gone on from there. In a few cases there is more damage (e.g., C indicates one rib damaged, whereas my C error has three ribs damaged.)
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Danzig Study Group U.S.A.
Danzig Report Nr. 154 - October - November - December - 2011, Page 4.