I got this at an estate sale. Took a chance that it might be real, no COA. I found two others online that look similar. If it isn't real I will be looking for a replacement for the frame if anyone has a similar 20 by 20 photo from the Cleveland Williams fight. Please let me know what you think.
I agree with Robert, I think it's real. The best place to research Muhammad Ali autographs is Shawn Anderson's Aliautos.net. It's an incredible resource. Here's a link to his exemplars: