I agree print defects (anomalies) fall under a different category than true variations. Setting aside the cut lines portion of the topic and focusing on the card stock backs I would heavily lean towards calling them variations since the '52, '56, '59, and '60 sets all have accepted card stock back variations. The main difference would be (aside from 1970 being a dull year) that those others were limited to a certain range of card numbers or a certain series whereas 1970 appears to have the entire set in both variations.
Does anyone have any 1970 OPC's lying around? Maybe the white card stock was the same used for that release?
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COLLECTING BROOKLYN DODGERS & SUPERBAS
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