J-C. Sabrier, (La Longitude en Mer à l'heure de Louis Berthoud et Henri Motel, Geneva, 1993, p. 593) notes that Jean-Francois Henri Motel (1786-1859) was Louis Berthoud's (1754-1813) best known pupil. The present chronometer closely resembles another early example, No. 38 (see Sabrier, pp. 605-607). Having studied at the École des Arts et Métiers at Chalons Motel went at Government expense to work with Berthoud. He had just finished his apprenticeship in 1813 when Louis Berthoud died. He stayed on to run the workshop. In 1823 Motel was given the highest accolade and made Horloger de la Marine. He had left the Berthoud workshop by 1817 and did some occasional contract work for Breguet whilst the Ministry of the Marine sent him chronometers for repair. By 1821 he was in full production, making his own chronometers. His grande marines were sold for around 2,400 francs with deck watches or petite marines selling for about 1,500 francs.