This patent details the sliding lock present on most Excelsior Park watches in the 20th century.

This patent was registered in Germany as DE388992C on January 28, 1924.

This was the first patent registered using the name Excelsior Park, though it still lists Les Fils de Jeanneret-Brehm as the primary name. It also includes the Speedway Watch Co. name, which was used in English-speaking countries at that time.