I'll have to take a look. Any chance you could include sales data from comc.com? There are a lot of PSA graded cards on there that get sold every day through their site and cross-posted through Amazon.com.
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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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