The oc qualifier isnt the same across all grades. For example the centering has to be 65/35 or better in a PSA 9 card but only has to be 80/20 or better for a PSA 6 card. Hence why you'll see a PSA 9 and a PSA 6 or 7 with similar centering but the 9 has an oc qualifier and the 6 or 7 doesnt.
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