Swiss 18K pink gold and enamel keyless pendant watch Circa 1890

Gold watch with an enamel portrait of a lady 
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A fine Swiss 18K pink gold and painted-on enamel keyless pendant watch, circa 1890. A polished band, bezel set with pearls, the back painted on enamel with a portrait of a lady set with four diamonds on a red guilloche enamel background, border set with pearls and a hinged gold cuvette. White enamel dial, Arabic numerals, outer gold dot minute divisions and gilt Louis XV hands. A matte gilt movement, eight jewels, cylinder escapement, three-arm balance with blued steel flat balance spring, and an index regulator.
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Diameter: 24 mm
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Signed: No Name
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The case is slightly scratched.