Swiss 18k gold open faced pocket chronometer Circa 1905

Gold open faced lever watch by Vacheron & Constantin
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A fine and large Swiss 18 carat gold open faced keyless lever pocket chronometer, circa 1905. Frosted gilt movement, 18 jewels, wolf’s tooth winding, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swan neck micrometer regulator. Gold hinged cuvette. White enamel dial with bold upright Arabic numerals, outer minute track, subsidiary seconds and original gold spade hands. Frosted gilt movement, 18 jewels, wolf’s tooth winding, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swan neck micrometer regulator. Solid, polished case with sunray engine turned case back. Dial, case, cuvette and movement signed, case numbered. Accompanied by a fitted box.
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Diameter: 57 mm
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Signed: Chronometre Royal Vacheron & Constantin Genève