The Buren 30 watch movement is a variation of the Record design, which was adopted by Longines after the acquisition of Record. It is currently unknown if other variants of this movement were also produced as Wittnauer calibres. The C11KS1 movement is available in manual-wind versions, as well as an automatic version without a date function. The specific differences between the C11KS-1 and C11KS/1 variations are not known. This movement offers functions such as manual winding, a sweep second hand, and a quickset date feature achieved by repeatedly pushing the crown. It was commonly used in watches manufactured around 1960.