I have a baseball , an 8x10 , and 4 index cards from the late 1980s all in person and they all favor yours with the exception of the starting point of the first "a" in Kaat as you list. Mine have the straight line leader into the "a". I also have a hand written note to me that has a variation on his last name formation that I never seen, but it is definitely his signature; and it has an "a" that is like yours on the card. Everything else on your card looks like his signature, so the difference in the "a" maybe a signature variation that is occurring over time. I would like to know when the card was signed out of curiosity.
IMO I would say the card is ok.
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