Once I caught a pick during a concert and it was brand new and I decided that I will use this pick for my playing cause it felt the best, but few months after playing with that pick almost everything came off, you could barely see the bands logo and I kinda regret doing that. If I was you I wouldn’t play it but have it just as a collectors item because you don’t want to make the autograph go away, but then again I understand that it’s a very good guitar and it would be a shame just looking at it collecting dust… so maybe you can put some transparent tape over the autograph so it will protect it but I’m not completely sure if that would work, I don’t want you to get your autograph ruined but that’s the only thing that comes to mind. Maybe someone else has a better idea?