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Hank Aaron auto ball help. Signature differences

I am watching a Hank Aaron auto ball on ebay that is PSA/DNA certified. I am concerned because Aaron's signature looks drastically different (much larger) on other PSA/DNA autographed balls. Does anybody have an explanation for this? Is it safe to bid on the small signature ball? See links below.
Small signature
Large signature
Thanks
Brian
Small signature
Large signature
Thanks
Brian
0
Comments
<< <i>The larger signature is from more recent times. >>
Exactly. He has done some signings with Steiner recently and all the baseball sigs are large. Maybe he is having a hard time writing on baseballs as he gets older. The ball I picked up recently has a larger signature.
I think folks should pick up an Aaron autograph while they can still be had for cheap. I don't think his autograph gets the love it should considering he is one of the greatest of all time.