Chicago Speedway Pin (Back)

This is the back side of the Chicago Speedway Association medal presented to Barney Oldfield. The inscription reads, "Barney Oldfield - Master Driver - This Medal of Merit and Appreciation is Awarded in Recognition of His Many Preeminent Achievements and Years of Strenuous Loyalty to the Sport of Motor Racing."

If you have any information about this medal; why and when it was awarded, please comment.