The December 2025 PSA buyback scandal, involving secret grade upgrades after card buybacks, is shaking trust across the $5B sports card market.
A post by the official Topps account on X confirmed the sale saying, “JUST SOLD: Kon Knueppel’s 1-of-1 Superfractor autograph fetched $396,500 at auction, making it the most expensive Kon Knueppel ...
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