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Fred CI guess that must be the "grading" evolution scale...
I think SGC and PSA are generally close. GAI, fuggetabout'em. Lots of issues with altered cards in non-AUTH holders. SGC is the most consistent and they have the best customer service (between SGC and PSA). PSA has slabbed more cards but I truly believer that they've also, proportionally, have made more and greater mistakes than SGC (grading wise and customer service wise). I don't much about Beckett grading so I'll leave them out of the comparison.