Swiss repeating grande and petite sonnerie lever Circa 1900

Gold minute repeating two train grande and petite sonnerie clockwatch
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An extremely rare, large Swiss 18 carat gold open faced trip minute repeating two train grande and petite sonnerie keyless lever chronometer clockwatch, circa 1900. Bulletin de l’Observatoire obtained at the Observatory of Neuchâtel in 1902. Retailed by Hauser Zivy & Cie, Mexico-Paris. Rhodium plated movement, fausses côtes decoration, twin barrels with differential tandem winding, 36 jewels, three in screwed chatons, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overcoil and swan neck micrometer regulator, striking and repeating on gongs by means of a trip slide on the band, sonnerie/silence and petite sonnerie/grande sonnerie selection levers under the bezel. Gold hinged cuvette engraved with the technical and retail details highlighted with blue, white and black enamel. White enamel three piece dial with narrow  Roman numerals, subsidiary seconds and original black steel pear hands. Case engine turned to the back. Dial and cuvette signed by retailer. Accompanied by the Bulletin de Marche, original red leather fitted case with two spare glasses and an extra three piece enamel dial.
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Diameter: 57 mm
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Signed: La Esmeralda Mexixo
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Any complication such as a striking train affects the timekeeping of a watch meaning that watches with striking, repeating or chronographs were not usually submitted for observatory trial, certainly a clockwatch would not normally be considered to be a precision watch. However, this watch was awarded a certificate from the Observatory of Neuchâtel and as such is extremely rare.