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Brent ButcherNagurski was in a psa 9 holder when BMW first had it graded. They crossed it over to an sgc 96 right before they sold it. Had the under bidder won it the card would have been crossed back to psa.
I know a lot of privately held cards would break the 6 figure mark but one that was recently graded that would go well into 6 figures would be the SGC 98 1914 CJ Joe Jackson.