Swiss gold and enamel keyless lady’s pendant watch Circa 1900

Gold lever open faced brooch watch
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A very fine and rare Swiss 18K gold and ramolayé enamel keyless lady’s pendant watch with an 18K gold, ramolayé enamel and rose-cut diamond set fleur-de-lys brooch fitting en suite, circa 1900. Rhodium plated movement, 15 jewels, straight line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, index regulator.
Case, bezel and band decorated with pale green ramolayé enamel with gold leaf scrolls, the back cover decorated to match and with two initial H mirrored.
Off-white enamel dial with black Breguet numerals, outer gilt dot minute markers. Gold Louis XV hands. Cuvette and movement signed. 
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Diameter: 25 mm
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Signed: Vacheron & Constantin, Geneve