This Autographed 1999 World Series Logo Oml Baseball has been Personally Signed by Mariano Rivera, Joe Torre, Don Zimmer, Mike Stanton, Willie Randolph, Daryl Strawberry, Joe Girardi, Hideki Irabu, Orlando Hernandez, Roger Clemens, Andy Pettitte, José Cardenal, Mel Stottlemyre, (Clubhouse Versions: Bernie Williams, Derek Jeter, Jorge Posada & David Cone) of the New York Yankees. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by JSA. The authenticity can be verified on JSA website.