When Stutz made fire engines, they made a different and particular radiator badge for those, and a Motometer, just for the fire engines

Stutz began his fire engine business in Indianapolis in 1919 and built engines and ladder trucks until the Crash of 1929. This rig was his smallest model. The town of Havre de Grace, Maryland bought it in 1924. In 1935 they traded it to the New Stutz Fire Engine Company, successor to the original Stutz firm.

http://www.hallofflame.org/Motorized8.htm