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Marc S.There isn't anything obvious to me that would suggest it is not authentic.
Incidentally, Feller has always been one of the easiest (and least expensive) signatures to obtain in all of baseball. One of the truly nice guys of the sport. Because of his propensity to sign thousands upon thousands of signatures, the supply is so great, that I think that there was never a huge demand to forge his signature.
I met him a few times in the late '80s and early '90s, and he was always fun to talk to...