Swiss 18 carat gold magnificently engraved pocket watch Circa 1910

Pocket watch with chronometer quality
–
A magnificently engraved pocket watch in chronometer quality, made by Zenith SA in le Locle, Switzerland, circa  1910. This watch’s open faced case is crafted from 18 carat gold and has an engraved back lid with an empty cartouche in the center. The white enamel dial has Arabic hour numerals, a subsidiary seconds dial at 6 o’clock and gold hands. The cuvette is engraved with the medals won in Genève 1896 and Paris 1900 and the numbered precision lever movement has an anker chronometer escapement, 15 rubies, a spiral Breguet and a fine adjusting device.
The dial, cuvette and movement are signed.
–
Diameter: 49 mm
–
Weight: 85 g
–
Signed: Chronomètre Zenith
–
A “spiral Breguet” or “Breguet over coil” in pocket watch making refers to a specific design of the hairspring, the delicate spring that regulates the balance wheel’s oscillations. The over coil is the outermost coil of the hairspring, which is curved upwards and inwards, passing over the other coils. This design, invented by Abraham-Louis Breguet, helps the hairspring expand and contract concentrically, improving accuracy and reducing positional errors.