This Autographed 1989 World Series Baseball has been Personally Signed by Tony LaRussa, Dave Parker, Dennis Eckersley, Mark McGwire, Matt Young, Jim Corsi, Ken Phelps, Rick Honeycutt, Carney, Lansford, Rene Lacheman, Stan Javier, Curt Young, Dave Duncan, Mike Moore, Ron Hassey, Art Kusnyer, Make Gallego, Storm Davis, and five others of the Oakland Athletics. 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.