In The Sandlot, during Benny's dream, why did Babe Ruth ask to keep the baseball card of Hank Aaron?

I just got done watching a Sunday morning movie with my kid and during the dream scene in Benny's room, Babe Ruth picks up a baseball card of Hank Aaron and he says something like, "I don't know why, but can I keep this?" then pockets the card.

What is the significance of this moment? Seems like there's probably some baseball history I'm not aware of. Thanks!

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