Just a guess
My theory is that it is an original collector thing. All of the clipped corner cards from the near set I purchased were Piedmont 350 backs. Now, that is the most common one out there, but when you have some 290 of them in a single group and every one has that back, I have to assume that they came from the same source, and that that source got them from the same source. My assumption is that the original collector got them all from someone (or he himself) who was buying the Piedmont brand at the time that the 350's were in them. Said collector then clipped them to show they were his (as opposed to back stamping them) and there you have it.
That's my theory anyway.
Tom C
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