Important Swiss gold repeating complicated watch Circa 1914

Gold open faced complicated watch by Vacheron & Constantin
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A rare, important Swiss 18 carat gold open faced minute repeating keyless lever split seconds chronograph with perpetual calendar and moon phases, circa 1914. Nickel finished jewelled lever movement, bimetallic compensation balance, minute repeating on two hammers on to two gongs, repeat activated through a slide in the band, micrometer regulator, wolf’s tooth winding. Hinged cuvette engraved Vacheron Constantin Genéve Chronometre. White enamel dial with black Breguet numerals, outer calibrated fifth seconds ring with Arabic fifth divisions, four subsidiary dials for month combined with leap year indication, day and date, constant seconds combined with phases of the moon and lunar calendar. Polished circular case with blue champlevé enamel initials FPV to the back, split seconds chronograph mechanism operated through the crown and a button in the band. Case, cuvette, dial, and movement signed, case and movement.
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Diameter: 50 mm
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Signed: Vacheron & Constantin Genève