Swiss gold keyless split-second chronograph Circa 1915

Gold chronometro medical watch
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A rare Swiss 18 carat yellow gold keyless pocket watch, circa 1915. Chronometro Medical watch with oval button split-second chronograph, instantaneous 30-minute register and Guillaume balance. A polished case with a hinged gold cuvette. White enamel dial with Roman numerals, outermost chronograph ring with pulsometer scale graduated for 30 pulsations, subsidiary seconds dial at 6, 30-minute register at 12 and black steel spade hands. Rhodium-plated movement, Geneva striping decoration, 30 jewels, straight-line lever escapement, Anibal-brass Guillaume balance, blued steel Breguet balance spring, swan-neck micrometre regulator, visible chronograph mechanism. Dial, case and movement signed.
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Diameter: 55 mm
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Thickness: 15 mm
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Signed: Ulysse Nardin  Le Locle & Genève
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Ulysse Nardin SA is a Swiss luxury watchmaking company. Founded in 1846 in Le Locle, Switzerland bearing the name of its founder Ulysse Nardin. It has remained in continuous production since. The company became best known for manufacturing highly accurate marine chronometers (of which the anchor in the company logo is a reminder nowadays) used by over 50 of the world’s navies from the end of the 19th century till 1950. Furthermore, pocket watches with complications such as moon phases, a perpetual calendar, repetition and an alarm function were produced. According to the last official report of Neuchâtel Observatory in Switzerland, Ulysse Nardin had won numerous awards and honours for its marine chronometers from 1846 to 1975, including 4324 certificates, 2411 special prizes and 18 gold medals at International exhibitions.
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Ulysse was born in 1823 in Le Locle, Switzerland. He first trained as an apprentice horologist under his father, Léonard-Fédéric Nardin and perfected his skills under the tutelage of Frédéric-William Dubois and Louis JeanRichard-dit-Bressel. Two master watchmakers who were experts in precision watches and whose fame extended beyond the mountains of Neuchâtel. Ulysse established his own workshop at the age of 23. Despite growing up in the Jura mountains, he was fascinated by the sea and therefore produced nautical timekeeping instruments. The number of employees in 1900 was an impressive 300. The company was taken over and re-invigorated in 1983 by Rolf W. Schnyder who transformed it into a profitable business. Since 2014, it has been a subsidiary of the French luxury group Kering. Ulysse Nardin has operated out of the same building headquartered in Le Locle since 1865.