I have two Alice Cooper autographs, one current and one from 1994, this looks more like his autograph from the 90's. I wont offer an opinion as i am not an expert but I will post my 1994 in person for you to compare : )
In my opinion, this is a very nice genuine autograph that is signed on the Constrictor album on the year it came out. Alice autograph have changed a lot over his career. But this is the real deal.
I have some that I got in person from 1987, that looks just like this. (Exept for the year.)