Mariano Rivera Signed New York Yankees OML Insc. Baseball Beckett 41200 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is an New York Yankees Autographed Official Major League Baseball that was personally autographed by Mariano Rivera with "Exit Sandman" inscription. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.