Swiss gold open faced lever chronometer pocket watch Circa 1930

Gold chronometer lever pocket watch
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A Swiss 18 carat yellow gold open faced keyless chronomèter pocket watch, made by ARSA, Auguste Reymond SA in Tramelan, circa 1930. The case back is polished, an engraved cuvette with the mention A Monsieur/Abel Vuilleumier/pour 30 ans de fidèles et/loyaux services/A. Reymond S.A./Tramelan (To Mr Abel Vuilleumier for 30 years of faithful and loyal service, A. Reymond S.A., Tramelan). The case is made by Charles Kohli, Tramelan. White enamel dial with suspended Breguet numerals, outer minute track, subsidiary seconds at 6 and blued steel Breguet hands. A rhodium plated movement, going barrel, straight line lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator. Signature on the dial, case and movement.
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Diameter: 50 mm
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Weight: 77 g
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Signed: ARSA by Auguste Reymond SA, Tramelan
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Arsa-Unitas
Arsa (Auguste Reymond SA) was a watchmaking company in Tramelan, Switzerland. It was founded in 1898 and initially produced watches under the brand name ARSA and later also under the name Unitas. The company was known for its high-quality movements and timepieces. In 1926, Auguste Reymond SA acquired the Unitas Watch Company.
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Unitas was a maker of ébauches (unfinished movement parts). The movement-making part of ARSA became part of the Ebauches Group in 1932, known as Fabrique d’Ebauches Unitas S.A. ARSA was known for its sports watches and chronographs, as well as watches for the blind. After the quartz crisis, the Auguste Reymond brand was bought by Montres Nitella SA in 1989 and relaunched with a focus on mechanical watches.