Enamelled gilt duplex watch for the Chinese market Circa 1840

Enameled silver gilt Chinese market pocket watch
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A centre seconds duplex made for the Chinese market in a pearl set silver gilt and enameled open face case, circa 1840. Keywind gilt bar movement with richly engraved bridges and suspended going barrel, blue steel stop work, and screws. Engraved sector cock with garnet endstone, polished steel regulator. Five arm polished steel balance. Duplex escapement, brass escape wheel, pivots with endstones. White enamel dial with centre seconds, slender Roman numerals, and gilt hands. Unusual silver gilt open face case, the front bezel, front of the oval pendant and bow set with split pearls. On the reverse the bezel, pendant and bow are decorated with blue champlevé enamel. The back of a finely painted polychrome enamel portrait of a young lady on a blue background. Wound and set through the sprung gilt cuvette.
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Diameter: 55 mm
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Signed: Richardson London
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A very well executed portrait on an unusual case. In excellent condition.