This Autographed Bobby Brown Oal Baseball has been Personally Signed by Ken Griffey Jr. Also signed by Mike Brumley, Mike Paul, Matt Sinatros, Brian Giles, Jim Lefebvre, Harold Reynolds, Dave Valle, Mike Jackson, Bill Swift, Scott Bradley, Gene Clines, Brian Holman, Gary Eave, Scott Bankhead, Rusty Kuntz, Matt Young, Henry Cotto, Pete O'Brien, Greg Briley, Alvin Davis, Erik Hanson, Mike Schooler and Keith Comstock of the Seattle Mariners. 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.