Excelsior

The Excelsior Supply Company Founded in Chicago, IL, in 1876 supplying machinery, automotive and motorcycle parts. They launched their own motorcycles  in the 1905-1907 time-frame,

In 1911 the American Henderson Motorcycle Co, of  Detroit, Michigan, was formed.

Excelsior Motor Manufacturing & Supply Company  was purchased by Ignaz Schwinn, proprietor of bicycle manufacturer Arnold, Schwinn & Co. in 1912

In 1917 the Hendersons sold the firm to Ignaz Schwinn, owner of Schwinn, the manufacturer of Schwinn bicycles and Excelsior motorbikes.^[8] Production was moved to Schwinn's Excelsior Motor Mfg. & Supply Co., 3701 Cortland Street, Chicago, Illinois.

Hendersons were marketed extensively overseas as well as in the United States during the Schwinn years. 

Due to the depression, Schwinn ordered Excelsior's operations to cease in September 1931.

1

Henderson Four