And Derek Jeter's official Rookie Year is 1996, so these are all pre-rookies. But the widely accepted answer are the nationally released professional MLB sets from 1993 (also including Pinnacle and some others not yet named).
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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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