A friend has procured in trade a 2015 AGV Pista GP Rossi, autographed by the man himself, and is trying to see how much it might be worth. New w/ tags, box and all. Also, is there any way to verify a Rossi autograph?
It's worth like $1400, but you'd have to wipe the scribbles off the shield so you can see where you're going.
Not quite an autographed helmet, but more an autographed visor. (a couple on eBay right now for $199 plus whatever the helmet will sell for on it's own)