Very fine Swiss gold open faced lever pocket watch Circa 1910

Gold lever by Vacheron & Constantin
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Very fine Swiss 18-carat gold open faced keyless wind lever pocket watch, circa 1910. Gilded brass movement with going barrel, gold screwed chaton (setting) on the central wheel, straight-line lever escapement, compensation balance with gold poising screws and blued steel hairspring with a terminal curve, index regulator with swan neck spring and micrometric screw. White enamel dial with Arabic numerals and subsidiary seconds at 6. The case back guilloché engine turned, sunray motif. Dial signed, case and movement signed and numbered.
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Diameter: 57 mm
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Signed: Chronometre Royal Vacheron & Constantin Genève