Here are two other examples of his recent autographs:
The 1st is a sit down autograph that he did for me at a private signing in April- May of 2015 on full, unsed tickets to his 1st and 2nd no-hitters.
The second autograph was applied to a ball at Spring Training and was provided by a poster on net54 within the last year or so.
One is pretty easy to authenticate, but the other is a real challenge.
I don't realistically know how you could authenticate the OP's ball or this one in this thread IMHO.
