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.