Swiss gold repeating carillon grande sonnerie lever Circa 1912

Gold minute repeating clockwatch attributed to Zenith
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A fine, very rare Swiss 18 carat gold open faced trip minute repeating two train carillon grande sonnerie keyless lever clockwatch, London import marks for 1912-1913. Frosted gilt movement, two train with differential winding, 27 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator, striking the hours and quarters on three gongs with three stacked hammers, Silence/Chime selection lever on the bezel border, repeating activated by a trip push-piece in the band. Gold hinged cuvette. White enamel dial with Roman numerals, outer minute track, subsidiary seconds and blued steel spade hands.  Polished case. Case and dial plate punch numbered 4253.
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Diameter: 49 mm
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Signed: No name
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This type of minute repeating grande sonnerie clockwatch movement with carillon on three gongs with three stacked hammers but without petite sonnerie, were usually commercialised by Zenith using the Cesar Racine patent.