Is the football player from the Mayo Cut Plug set? That's the first place I would check. But yes, if it's a post-production addition, it could have the baseball player underneath and a soak (if it was glued in with paste glue) would reveal that.
Was the pinback sold as blanks?
Where was it found?
I guess if it was me, I'd start with the late 1890s yearbook photos from the major football schools at the time: Harvard, Yale, Princeton, Rutgers...
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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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