Hi -
You say that a friend got the Mantle at spring training over 50 years ago. If I was you, I would take the word of your friend and enjoy your Mantle autograph, and the thought of your friend meeting him on a sunny spring day.
Do you really want to take the opinion (and that's all it would be) of those of us who may be experts, but who you do not know, over the word of your friend? It's not like you could sell that scrap of paper and buy a new house. Maybe a nice dinner.
As for the Musial, "over the internet" covers a lot of area. Was it from Stan's company, or was it from a purveyor of fine (possibly) forged autographs such as Coaches Corner, or from some place in the middle of the "potentially real scale"?
Enjoy what you have,
Doug
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