The ETA 955.291 watch movement, which was used from 1977 onwards, features a pointed balance staff supported by white jewels. Its unique design incorporates a conventional balance system that is stabilized by a quartz-controlled electronic circuit, delivering a pulse during each balance period. The movement is equipped with a sweep second hand and offers several functions, including the ability to set the day by +/- 24 hours, a quickset function for the date, and an electrical hack feature.