Need help verifying if this is real

As per the title, not sure if this sub is the right place for this, but I'd be really grateful if someone could at least give me an indication as to whether or not this could be real. Got it from a friend on my birthday, who said it was given to his father by a collector, and is supposedly real. I'm not familiar with Cristiano's signature so I really have no idea how to verify this.

Not looking to sell it, and I'm happy with it regardless, but I'm really curious.

I can provide some more pictures if necessary.