The Mantle signed cards would all be submitted to PSA/DNA for authentication. If the Score one is numbered on the back with a marker, it was a factory issued autograph.
I'm not a fan of some of the balls, but I am not an auto authentication expert.
Mantle spent a lot of time in Oklahoma City, so having hand-signed items there make sense.
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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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