Luis Aparicio of the Red Sox steals the 500th base of his career in a 9 – 5 loss to Milwaukee. It is the highest total in the American League since Eddie Collins retired in 1930.

On july 1, 1973 Luis Aparicio of the Red Sox steals the 500th base of his career in a 9 – 5 loss to Milwaukee. It is the highest total in the American League since Eddie Collins retired in 1930.

Source
Baseball Reference July 1