I know that high grade PSA 8-9 1952 Topps cards crashed right around that timeline based on some research I did when PSA first opened up the Auction Prices Realized tool.
https://www.net54baseball.com/showth...light=realized
One card dropped from $10K to like $800.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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