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BradHere's an extremely high graded 51 Mantle an SGC 96, most prewar collectors consider SGC as being the toughest grading Co. in the industry.
I wonder if SGC would grade the PSA 10’s “listed above” an SGC 100, I highly doubt it, if anything the cards would be down graded!
It proves that humans are not reliable and far from consistent when grading high grade cards!