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JimBSeveral years ago I submitted a card I was sure was going to get an 8 and possibly a 9. When it came back PSA 6, I was really upset. I resubmitted it raw a few months later and it came back a 6 again. I went to the PSA booth at a show to ask why and they argued there was an extremely faint wrinkle on this otherwise mint card and that 6 was the highest grade a card could get with a wrinkle. Now this "wrinkle" (if it even exists) is so faint that it is dificult to see under 10X magnification and I personally think it is b.s. It looks like the natural unevenness of cardboard to me. To their credit, they did give this mint card the same grade twice in a row. I happily have the card out of any authenticator's holder now.
JimB