This Autographed Oal Baseball has been Personally Signed by Hal McRae, Jeff Montgomery, Mike Magnante, Mark Davis, Ron Reed, Steve Shifflett, Keith Miller, Gregg Jefferies, Chris Gwynn, Luis Aquino, Gary Thurman, Wally Joyner, Brian McRae, David Howard, Brent Mayne, Mark Gubicza, Lee May, Mike MacFarlane and Guy Hansen. The signature of George Brett has been deemed a clubhouse version of the Kansas City Royals. 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.