Ted, does this indicate that the backs were not printed consecutively, but rather in a more random fashion? If only 10 % of Piedmonts bear this mark, then the plate must have been corrected after the first 10% were printed. But if a few Sweet Caporals and Old Mills have the mark, then they would have been printed after the 10% of the Piedmonts, but before the 90% that don't have the mark.
So the printers didn't just print all Piedmonts, then all Sweet Caporals, the all Old Mills, etc.?
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