This Oakland Raiders mini-helmet is signed by Bo Jackson. Jackson is one of the most unique athletes in sports history as he played both professional baseball and football concurrently. He was an outfielder for the Kansas City Royals, and Chicago White Sox as well as a running back for the Raiders. Jackson was one of the best in both leagues, until he injured his hip causing a pre-mature retirement. Jackson remains one of the greatest athletes people have seen, and one of the greatest "What-If" stories had he never gotten hurt. The autograph is authenticated by Steiner Sports.