Opinion on Mohammed Ali autograph
 

Have had this for many years and not sure if authentic.I got it in a very old collection and does appear to be old. I have compared to examples of some his autographs and a lot of it looks good but not sure about the lead in to the "M". Also not sure what time period it would be from.

I have found a couple examples online that are similar. I have listed mine and one I found online.

Picture 1 is the one in question. Picture 2 is the example. Picture 3&4 is another I have.

If it's actually Muhammad Ali, he actually spelled his name wrong identifying himself... ;)

The first one with the misspelled name identifying it as absolutely authentic. Likely someone who didn't know how to spell Clay's new name. Nice autograph

check this out; http://www.aliautos.net/examples.html