This baseball comes with a very nice Roberto Clemente autograph and more importantly it is signed "Bob" which is extremely scarce. When Clemente first came through the big leagues they tried to Americanize him by adorning the Bob moniker instead of calling him by his real name, Roberto. Thankfully that was scraped. The only other Hall of Famer on the ball is Bill Mazeroski.
 
The ball also comes with a full letter of authentication from PSA.