Don Mattingly autographed New York Yankees Official Major League Baseball featuring an extensive collection of career inscriptions including Donald Arthur Mattingly, Donnie Baseball, 6x AS, 84 AL Batting Champ, 3x SS, NYY 82 95, #23 Retired NYY, 9x GG, 85 AL MVP, NYY Captain 91 95, .307 B.A, 222 HRs and 1099 RBI. This limited edition baseball is individually numbered 11 of 12 and is accompanied by a Steiner Sports COA (Certificate of Authentication).