New York Yankees Unframed 11x14 MLB Photo hand signed by Don Mattingly and Tom Seaver. The item and signature are in excellent condition. Don Mattingly is a former Major League Baseball first baseman and manager. Mattingly played his entire 14-year MLB career with the Yankees. Tom is a former professional baseball player who played 20 season in the MLB. AUTHENTICATION: The item is accompanied by a JSA Certificate of Authenticity - JSA Serial Numbered Hologram -