Wish I could see all the characteristics. The very florid style does look like his signatures post-1970, if his, I'd sat sometime in 1972 but I can't see any of the characteristics clearly enough to recognize where the all-important tells would be.
Just not enough to see here to judge it one way or the other.
I wouldn't have given it much thought but It's from a long time autograph collector who I've known to only deal with legit items. There is a whole back story to this, which is probably true. But just because somebody had a "connection" to a team or player doesn't mean that the item isn't a secretarial.
At this point I am going with possible fake/secretarial, not a good example if real.