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T206CollectorFirst, I agree that back damage is back damage, period.
Second, I disagree that "there are variances within every grade." In fact, grading is more like a pyramid -- all SGC 100's or PSA 10's should look identical. The lower down the scale you go, the more variance you will have in a card's appearance. At the bottom, there are countless ways for a card to receive an SGC 10 or a PSA 1. So, the important thing to remember when viewing an SGC 10 or a PSA 1 is that there could be any number of serious problems with the card.
The reason I prefer SGC is that I know what an SGC 30, 40, 50 or 60 T206 card looks like. I know what the permissible flaws are at each level. And SGC is remarkably consistent within those ranges.