Although it was made after Louis Berthoud's death, this chronometer is identical to that produced in his workshop as early as 1800.This chronometer illustrated in detail by J.-C. Sabrier in La Longitude en mer à l'heure de Louis Berthoud et de Henri Motel, Antiquorum Editions, Geneva, 1993, pp. 307-308-309.Berthoud Frères. Louis Berthoud had two sons:One, Jean-Louis-Simon-Henri, usually called Louis like his father, born at Argenteuil 7 October 1793, died at Argenteuil 15 April 1880. On 17 April 1819 he married at Paris Thérèse Joly daughter of a watch-case maker.The other, Charles-Auguste, born at Argenteuil 17 November 1798, died 15 February 1876. He married at Paris 26 January 1822, Henriette-Pauline Joly, second daughter of the watch-case maker.When Berthoud died suddenly, 18 September 1813, his widow appealed to Motel to run the workshop and complete the training of her two sons.Following the departure of Motel, the family workshop continued making marine watches in the same tradition under the trade name of Berthoud Frères. The two brothers divided the work between them. The elder, Louis looked after the retail outlet in Paris, and Charles-Auguste directed the workshop at Argenteuil. The chronometers produced by their manufacture were noticed at the exhibition of 1819. At the exhibitions of 1823 and 1827 the jury awarded them the Silver Medal.Jean-Louis-Simon-Henri, who called himself Louis like his father, abandoned chronometry to devote himself to the retail business. Charles-Auguste continued making chronometers retaining the same calibre.Literature:J.-C. Sabrier: La Longitude en Mer à l'Heure de Louis Berthoud et Henri Motel, Antiquorum Editions, Genève 1993.Charles-Auguste Berthoud (1798-1876), was born in Argenteuil on November 17, 1798. He was one of the youngest pupils at the Ecole d'Arts-et-Métiers of Compiègne, which was transferred to Châlons-sur-Marne in 1806. Together with his elder brother, Jean-Louis-Simon-Henri Berthoud, Charles-Auguste was taught the art of precision watchmaking by his father, Pierre-Louis Berthoud; when the latter died at the end 1813, it was his foreman, Jean-François Henri Motel, who continued to teach the boys.Having finished his apprenticeship, Charles-Auguste Berthoud became in charge of his late father's workshop in Argenteuil, while his brother managed the shop in Paris. The work of the two Berthoud boys was already highly praised at the Exposition des produits de l'industrie française in 1819, and they were awarded a Silver Medal at the Exhibitions of 1823 and 1827. No longer in partnership with his brother, Charles-Auguste was then awarded a Gold Medal at the 1834 Exhibition and, in 1839, was apointed by the Ministry of Agriculture and Trade to succeed to Perrelet as the head of a school of precision watchmaking. At the 1844 Exhibition, he was commended for his teachings at the school and received a confirmation of his Gold Medal, which he received again at the 1849 Exhibition when he was also named Chevalier de la Légion d'honneur.During the siege of Paris in 1870 a large part of the work that was in preparation was destroyed together with the tools and instruments that had come from his father's workshop.Charles-Auguste Berthoud was a sober man who enjoyed a quiet family life. During his working career, he produced some350 marine chronometers and a few pocket chronometers. Unfortunately, sorrow for the death of loved ones was to fill his later years and he died on February 15, 1876.Literature:J.-C. Sabrier: La Longitude en Mer à l'Heure de Louis Berthoud et Henri Motel, Antiquorum Editions, Genève 1993.