Swiss gold enamel Art Nouveau pendant watch Circa 1900

Gold enamel lever watch by Vacheron & Constantin
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A yellow gold Swiss enamel open faced keyless-winding Art Nouveau lever pendant watch, circa 1900.
Gilded brass movement with going barrel, straight-line lever escapement, and compensated balance with gold poising screws and blued steel flat hairspring. Cream enamel dial with black Arabic Dauphine radial hours, outer minutes track, subsidiary dial for the seconds, and blued hands. Round-shaped 18K yellow gold and vieux-gris (grey-green) flinqué enamel (translucent enamel over guilloché engine-turning) case, case back with floral pattern; chiselled band and bezel. Cuvette (dome) engraved with the mention Minnie Senff / 5 April 1903. Dial, case and movement signed.
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Diameter: 30 mm
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Signed: Vacheron & Constantin, Geneve