Swiss centre seconds duplex for Chinese market Circa 1850

Silver Chinese market duplex pocket watch
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A Swiss silver open-faced center seconds duplex pocket watch made for the Chinese market, circa 1850. Keywind gilt bar movement with richly engraved plate, bridges and suspended going barrel, polished steel regulator, blue steel stop work and screws, polished steel three-arm balance with three blue steel affixes, spiral hairspring, steel crab tooth duplex escape wheel allowing the hand to beat seconds. Fully restored white enamel dial with Roman numerals, centre seconds, gilt seconds hand, and blue steel hands. Engine turned case, sprung glazed cuvette, silver oval pendant and bow.
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Diameter: 56 mm
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Signed: No name