The Wittnauer C11KS-1 watch movement is a manual wind movement that was used during the period from 1929 to 1937. It is equipped with a bimetallic screw balance and a Breguet hairspring. The signature on the movement is often or always Gruen 106 or octagonal. The frequency of the movement is either 18,000 or 20,160 A/h, although further information on this frequency is lacking in Gruen catalogs.