I read this from the beginning and emailed my friend Steve Z. on Sept. 27th that my initial instinct was that it was authentic.
I also wrote Steve, that the photo posted was not a good image to opine from because "speed" is crucial to opining Joe DiMaggio's autograph.
I would still like to have it in my hands or have a better photo to opine 100%.
I would have commented earlier but I had my reasons why I didn't and Steve Z. knows why and we will keep that between us two.
Below is a side-by-side of one of my DiMaggio autographed baseballs and the one posted here.
Mine is on the right.
As you can observe, my DiMaggio shows more speed, but the other photo, which I attempted to enhance, does not show the same speed, but that could be because of the photo.
Net54DiMaggio2AndMyDiMaggio.JPG