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PCFor early tobacco cards printed by the ATC, I do not think the number of cards in a series or the total cards in a set, or the number of known variations (including the 17 T59s), has any bearing on how many cards are on a print sheet, or how those cards are arranged in rows and columns on a sheet.
The total numbers of each set/series vary, and when you look at the different back combinations, any number for a row is possible, and you can find justification for almost any reasonable number. 12, 17, 19 ... all are plausible.
Which is why I come back to the Obak sheet -- a 175 card set, which is not evenly divisible into its rows of 19, with multiple (and seemingly randon) repeating patterns of cards.
There was a method to the madness. We just don't know for certain what it was.
(Also, 187 divided by 17 is 11.
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