This Autographed Bobby Brown Oal Baseball has been Personally Signed by Johnny Oates, Ellie Hendricks, Jeff Tackett, Tim Hulett, Arthur Rhodes, Chito Martinez, Bob Milacki, Storm Davis, Mark Williamson, Todd Frohwirth, Sam Horn, Joe Orsulak, Leo Gomez, Greg Biagini, Gregg Olson, Mickey Tettleton, Mike Flanagan, Randy Milligan, Glenn Davis, Billy Ripken and Mark Parent. The signature of Cal Ripken Jr. has been deemed a clubhouse version of the Baltimore Orioles. 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.