I'm certainly no expert, but I looked at several exemplars of Ty Cobb's handwriting online (there are several handwritten letters....you can Google them). I don't think your example is Ty Cobb. The letter "g" is consistently different in the online examples, among other differences. But, again, I'm no expert............perhaps others with more knowledge will respond. I know there are several signature/handwriting experts on this board.
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Tim
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