Due to the poor grade of rubber cement used to make baseballs because of wartime rubber shortages, a different type of baseball is put into play today with dramatic results. In eight games, six home runs are hit compared to a total of nine homers tallied in the season’s first 72 games.

On May 9, 1943 — Due to the poor grade of rubber cement used to make baseballs because of wartime rubber shortages, a different type of baseball is put into play today with dramatic results. In eight games, six home runs are hit compared to a total of nine homers tallied in the season’s first 72 games.

Source:
Baseball Reference May 9