You might be disappointed to hear my opinion but I have to say it's a fake. A couples of serious errors, including the fact that the signature looks written on and not "signed" and the letters got progressively smaller as the signer went on, indicative of a forger concentrating too much on the fonts and not the size. A real auto would have letters of the same size, more or less. The "y" is suspect too. One more very important factor that is present in all authentic Morrissey autos is not here but I will not say what it is. Forgers get smarter all the time but they all seems to miss this point and I don't wish to alert them.
This is quite a good forgery in my opinion and can easily fool the casual collector. Just my opinion though.
I agree with the progression of the letters becoming smaller as the name is written.
And that Y... why would Morrissey go over it a second time?
The Ys are, of course not always, but are usually slightly curved.