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MattFrank - thanks for weighing in. I agree that overbacking would not be as easy as just printing the cards with the correct back in the first place, but by that logic, we wouldn't have overprints, either. Although, to be fair, adding an additional back is even more intensive then overprinting a factory. Furthermore, Piedmont were the most common backs - it would be odd that they had Old Mills lying around and needed to turn one into a Piedmont.
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