Fabrique d'ebauches de Peseux, S.A., commonly known as Peseux for the Neuchâtel locale in which it is located, was an ebauche maker dating at least to 1923. The company was incorporated by Charles Berner, a newcomer to town from Val-de-Travers whose father was director of the Technicum in La Chaux-de-Fonds. The factory had existed prior to Berner's arrival as part of other firms.
Charles Berner-Sandoz' company became a partner of Ebauches S.A. in 1928 and was absorbed into the holding company in 1932 as part of the overall industry restructuring at that time. It remained independent within Ebauches, however, producing calibres for many watchmakers. Charles Berner managed the company and was a director of Ebauches SA until falling on poor health in 1949 and his death on January 8, 1951.
Peseux was consolidated into the larger ETA conglomerate in 1985, with ebauche production moved to Grenchen.
One of the best-known Peseux calibres was the hand-winding chronometer movement, Peseux 260. It was used by many high-end brands and was quite capable at chronometry competitions. Another well-known product is Calibre 7001, an ultra-thin hand-wound movement introduced in 1971 and still produced today.