Congrats on the milestone! That really is impressive for the count. The only thing in my counts that can beat that number is my STL Cardinals total card count. None of my player collections even get close to your Gwynn count.
NO PWE's EVER!!! PLZ PM me 1st before sending a trade or buy offer.
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Largest total PC card collections by Team, then Athlete (as of 3/31/23):
STL Cardinals (MLB) - 8700+; Carolina Panthers - 2800+; GB Packers - 1700+ cards
Mark Martin (NASCAR) - 2034 cards; Jimmie Johnson (NASCAR) - 1776+ cards; Jeff Gordon (NASCAR) - 1563; Ricky Rudd (NASCAR) - 828; Ozzie Smith (MLB) - 692+