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Posted By: Aaron

Taken from the PSA website. Here is their defintion of the OC qualifier. OC (Off Center):
When the centering of the card falls below the minimum standard for that grade will be designated "OC." PSA determines centering by comparing the measurements of the borders from left to right and top to bottom. The centering is designated as the percent of difference at the most off-center part of the card. A 5% leeway is given to the front centering minimum standards for cards which grade NM 7 or better. For example, a card which meets all of the other requirements for PSA MINT 9 and measures 60/40 off-center on the front automatically meets the PSA front centering standards for MINT 9. If a card meets all of the other requirements for PSA MINT 9 and measures 65/35 off-center on the front, it may be deemed to meet the PSA front centering standards for MINT 9 if the eye appeal of the card is good