I think much of this research is spot on...I would only advise that just because a card is found with only three (or four backs) like Krause does not necessarily mean they are single prints. We know there were multiple printing in the same factory for the same back (the Hoblitzell and Moran variations confirm that). We also know that the print runs for different backs (Hindu vs. Piedmont 25) were vastly different. Overall, I think the research is great and does seem to jive with much of what I have seen...but that Krause list is not an SP list. When you start hoarding the set like I have, Krause, Schafer, Wallace white cap, are all pretty common and easy to find.
Just my opinion.
Joshua
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