This is an Official Rawlings baseball autographed by both Legendary New York Yankees 1st Baseman Don Mattingly and the current Texas Rangers All-Star 1st Baseman Mark Teixeira. Mattingly was Teixeira's favorite player as a kid and now plays the same position he did and wears his number 23. Official Ironclad Authentics Certificate of Authenticity and hologram, and MLB Authenticity hologram included with your order.