Durant, Weston and Mott had extensive business dealings. This wrench is stamped "WESTON-MOTT CO". The large end will fit early Durant hubcaps. The other two wrench openings may fit anything. It also has two short pins on one side, but I do not know their purpose.
I believe this wrench may have been supplied to Durant for Durant cars, or may have been supplied for General Motors cars. At a minimum, it is a historically interesting wrench.
I will bring this wrench with me to the Durant meet in Grand Junction next week.