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 autographed this Baltimore Colts 8x10 Photo with HOF inscription. Certificate of Authenticity from Athlon Sports.