In 1963, John Mackey joined the Colts and by 1966, had revolutionized the position of tight end in the NFL. Twice Mackey compiled season averages of more than 20 yards a catch, and his 10-year career average of 15.8 is considered remarkable for a tight end. John Mackey has hand signed this Baltimore Colts NFL Licensed 8x10 Photo. Bold blue full pristine signature with #88 inscription. Photo has minor dings, from signing, sold as is. Athlon Sports Collectibles Certificate of Authenticity. Image of actual item in stock - as shown