PSA 7 sold for $48K recently
https://sports.ha.com/itm/baseball-c.../50004-50710.s
PSA 6 for $28K
https://sports.ha.com/itm/baseball-c.../50004-50710.s
My guess is a PSA 8 goes for $100K to $125K, but just a guess. Best bet is to send it off to auction and let the bidders duke it out.