Plain silver Ø 58 mm with gold hinges, case maker's mark LJ (Louis Joly), signed and numbered B, 4196, additionally numbered 525
Silver dial signed Breguet et Fils, No.4196
Signed Breguet et Fils, Hgers de la Marine Royale, No. 4196, with gilt-brass three-quarter plate, Earnshaw-type spring detent escapement, bi-metallic compensation balance with large timing screws and parachute suspension, blued steel helical spring, winding square with pipe and going barrel
Two years after the demise of Louis Berthoud, the post of “Horloger de la Marine Royale” was entrusted onto Breguet in 1815. The development of chronometers went in full swing in 1801 with the entrance of Antoine-Louis, son of famed watchmaker Abraham-Louis Breguet.
The production of this pocket chronometer began in 1823 with completion in 1831, thereafter staying in Breguet's inventory until 1857. Despite being known for their going-barrel form of chronometer movement, which was developed on the principle of two going barrels, this example comes interestingly with a single going barrel, incorporating Breguet’s parachute ‘shock protection’ device which protects the balance pivot, maintaining the chronometer's precision.