Well, that's not a question that can have a simple yes/no answer.
It's possible the number was in more than one spot on a sheet.
It's also possible the sheets were more than 17 cards wide.
It's possible that some sheets did not have a factory number in the margin.
The art was changed between the 150 and 350 series, making things more involved
Add to that a few more possibilities like complex sheet layouts and the only answer that works is that 19 subjects show a marginal factory number Indicating a possible 19 different sheets.
Of course the 350 series also had art/plate modifications during the overall print run, many cards have differences that indicate at least two or three different printings. (And there may be differences between backs)
Steve B
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