Good question. There are all kinds of print defects or color printing issues that would need to be sussed out and appropriately weighted. I think your example error cards are not print variations, per se, since it looks like the omission of the black around "1969 Rookie Stars" is an intentional change to the black printing plate. All three cards have the black outline around the players and header, very clearly, and black is very tough to fade without damaging the rest of the colors.
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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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