Gold, enamel and pearl set centre seconds duplex Circa 1830

Extremely  fine open faced duplex watch 
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An extremely fine Swiss 18 carat gold, enamel and pearl set open faced centre seconds duplex watch made for the Chinese market, circa 1830. Polished and blued steel duplex movement, plain three armed steel balance. Glazed cuvette. White enamel dial, Roman numerals and sweep centre seconds. Case with black and white champlevé enamel floral decorated band and pendant, pearl set bezel, rim and bow, finely painted polychrome enamel scene depicting a seaside scene in the Ottoman Empire, a chain of mountains resembling the Taurus in the background, an estate to the left, a mosque and an anchored barque in the foreground, the pastel coloured sky with translucent enamel sunray effect over engine turned background in the manner of Jean-Louis Richter.
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Diameter: 55 mm
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Signed: No name