Autographed mantle ball
 

This is a bobby brown rawlings ball. Does this signature look authentic?I know its never 100 percent a guarantee but its not autenticated.

The photo isn't optimal, but definitely enough there to determine it's bad. Stay away from that one.

What things should you look out for on a mantle autograph and what are the red flags?

His fiest name doesn't look right, especially the CK. There are a lof of Mantle fakes out there, wouldn't consider one without authentication.