The Wittnauer C11K watch movement is a mechanical movement with various bridge shapes. Not much is known about the differences between the 1, 10.5''', 2, 10.5''', 30, 31, 50, 65 old, 66 old, 70 old, 71 old, 73 old, 76 old, 78, 90, 91, 107, 108, 110, 112 variations. However, a newer calibre maintains the same designation. This movement offers several functions, including manual wind, sub second, sweep seconds, automatic, and Incabloc shock protection. It was used primarily around 1940.