This Autographed William White Onl Baseball has been Personally Signed by Felipe Alou, Moises Alou, Mark Gardner, Jonathan Hurst, Dennis Martinez, Chris Nabholz, Sergio Valdez, Gary Carter, Delino DeShields, Tim Wallach, Larry Walker & 11 more of the Montreal Expos. 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.