I know the 66 Topps have 2 different types of card stock. One has a white back and the other has a darker more vintage look. I have no 66 OPC to compare the card stock with the 66 Topps I have.
Since the grading companies graded the ones on eBay as OPC I am guessing there is a difference in card stock.
If Doug does not take them I will.
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