"Lefty" Grove comes with or without this mark in the left border. It's a green line with a small red line above it. Most Grove's are found off-center with a thicker left border, but even those not cut properly usually don't have the mark. I don't know the sheet layout but would guess this is probably a mark from the sheet, by a single slot, for part of production. I have only noticed this on the normal cream stock, not the tougher glossy version of the issue (card on the right is the glossy).
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