Swiss 18 carat gold lever with twenty four hour dial Circa 1912

Gold open faced twenty four hour lever by Vacheron & Constantin
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A Swiss 18 carat gold open faced keyless lever pocket watch with twenty four hour dial, circa 1912. Gilt finished jewelled lever movement, bimetallic compensation balance. Gold cuvette. White enamel dial with Arabic numerals, rare red 24 hour inner scale, outer calibrated minute track, sunken subsidiary seconds. Hinged case back with family crest, inscribed. Case, cuvette, dial and movement signed, movement and case numbered.
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Diameter: 48.5 mm
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Signed: Vacheron & Constantin Geneve