Marine Chronometer N° 4620 by Breguet et fils,... Lot 440

Marine Chronometer N° 4620 by Breguet et fils, completed circa 1830. Signed on the dial "Breguet et fils" "N° 4620", this is a model with a toothed barrel; two-day autonomy, daily winding, removable escapement platform on ovoid plate, winding from the back. Equipped with a compensated screw balance, cylindrical balance-spring without terminal curves, Earnshaw spring detent escapement. All numbers match. Matte silvered brass dial, original silvering. Hour and minute displays at 12 o'clock, blued steel pear-shaped hands. Seconds display at 6 o'clock, blued steel hand. Original beveled bezel glass. Varnished brass mechanism case, gimbal-mounted. Walnut carrying case. Varnished brass handles. Reassembly key. Missing box lock key and lock plate. A detailed and complete condition report, notes and high-resolution photographs, available on request from the study and forming an integral part of this file. Dimensions 21.8 x 23.4 x 21.7 cm. Dial diameter 11.3 cm. Diameter of plates 10.3 cm. In public collections: Chronometer no. 5091, Musée Paul Dupuy, Toulouse. Chronometers no. 4815 and 4535, Musée des arts et métiers, Paris. Chronometers n° 4489 and n°4832, National maritime Museum Greenwich (UK). Bibliography : Georges Daniels, "L'art de Breguet", ed. Scriptar 1985. Tardy, "Dictionnaire des horlogers français" 1972. National Maritime Museum, "An inventory of the navigation and astronomy collections" Vol 1, 1970. Emmanuel Breguet, "Breguet, horloger depuis 1775" ed. Alain de Gourcuff, 1997. C. Breguet, "A.L. Breguet 1747-1823", manuscript, 1961. P. Ditisheim. R. Lallier. L. Reverchon. Cdt Vivielle. "Pierre Le Roy et la chronométrie" ed. Tardy. Paris. 1940. Expert: Mr. Marc VOISOT, CNES expert in watchmaking and bronze gilding. restauration@atelierchronos.com Expert's condition report available on request by e-mail to the firm.