I got this autographed photo from my uncle when I was 10, he is a real collectionist: he got 3 or 4 MJ's hats that had bought at auction, and so many other objects of the music world. When he had bought the hats they had given some of this autographs for free included in the price, unluckily I got no authenticity certificate. 

Can anyone help me to identify if it's a real one? Thanks