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NickMI've seen a Ramly SGC 60 with significant paper loss on the back, and I have a 1955 Bowman SGC 84 with a blatant back miscut.
GAI had to buy back on eBay a certified autograph card (cut signature) of Pete Maravich where the seller had written 1/1 on the card before it was slabbed.
Every grading company makes mistakes.