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jeff sSGC's grading scale is unclear about specific types of back damage, but the first time there is any mention of a piece of the card being missing is at a 20. I was under the impression that people generally didn't send cards like this in for grading (for the purpose of reselling) because it's much more saleable as "NM w/ minor paper loss on back" than SGC 20 or 30.
But if this is a legit 60, and there is any kind of pattern to this, I know that I, for one, have some more cards to send to SGC.