Important Marine Chronometer circa 1830
A model of 1815

Movement
The spring-driven movement of this chronometer is constructed between two circular plates. It has a single barrel and Earnshaw spring-detent escapement on a separate platform, with bimetallic compensation balance and helical spring, cylindrical balance weights and adjustment screws, all housed in a brass gimballed bowl.

Dial
The 10.5-cm silvered dial is signed and numbered Breguet & Fils nr 4859. It has a Roman hour chapter ring above and outer Arabic ten-minute divisions, the time being indicated by a pair of golden spade hand. Below is a seconds dial with Arabic ten-seconds divisions and a delicate blued-steel hand

Case
The two-tier walnut case of this chronometer has two external brass drop handles attached to the sides and a sliding top, inset with a diamond-shaped brass plaque which is engraved No 4859. When slid out, an observation port is revealed which allows the time being read without opening the top of the case. The front has a lock with a diamond-shaped brass escutcheon. The brass numb ered 4859Breguet winding key is situated in the top left corner.

Duration: Two days