Swiss 18K gold and enamel keyless pendant watch Circa 1900

Gold open faced cylinder watch 
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A fine Swiss, 18K gold and enamel lady’s keyless pendant watch, circa 1900. The case with a polished band, the bezel engraved with laurel leaves, the back overlaid with translucent aquamarine guilloche within white line borders, an engraved central rosette, outer border to match the bezel. Hinged gold engine-turned cuvette. White enamel dial, Breguet numerals, inner red 24-hour numerals, outer minute track. Gilt Louis XV hands. A matte gilt movement, eight jewels, cylinder escapement, three-arm balance with blued steel flat balance spring, index regulator.
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Diameter: 27 mm
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Signed: LeCoultre & Co.  Swiss