Bought it on eBay. The Ebay account is an estate sale with a lot of Star Trek autograph items.
For $35.00 I thought it was worth a shot.
FWIW seller offered money back guarantee +$50.00 if it is not authenticated by a reputable authentication company.
I have looked at a lot Shatner autographs and am not confident. Although different autographs do seem to be all over the place with little consistency. The S dipping down below the other letters makes me nervous. There isn't a noticeable 'h" either that a lot of his autographs do have. These inconsistencies could be due to the thick pen on such a small space.
Yes, its a nice photo too!
Wow, his signature has deteriorated considerably! I'll stick to my vintage stuff.
$24? If memory serves he has lowered his price a lot as well. It was closer to $100 and you got was a photo of him and a horse or him and his daughter or him alone perhaps, but no Trek.