This Autographed Bobby Brown Oal Baseball has been Personally Signed by Don Mattingly, Dave Righetti, Andy Hawkins, Bucky Dent (Clubhouse), Wayne Tolleson, Lance McCullers, Lee Guetterman, Mark Connor, Dave LaPoint, Greg Cadaret, Mike Blowers, Rick Cerone, Bill Connors, Mike Ferraro, Randy Valarde, Tim Lilly, Jeff Robinson, Bob Garen, Roberto Kelly, Erick Plunk, Clay Parker & Joe Sparks of the New York Yankees. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website.