Swiss gilt duplex made for the Chinese market Circa 1850

Gilt brass, enamel and split pearl set centre seconds duplex watch
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A very fine Swiss gilt brass, enamel and split pearl set open faced keywound duplex watch with centre seconds made for the Chinese market, circa 1850. Highly engraved movement, duplex escapement, large steel balance wheel, glazed dust cover. White enamel dial with Roman numerals, outer minute track and centre seconds. Large case, hinged case back with opaque light pink enamel background centered by a painted polychrome bouquet of flowers, split pearl set rim and bezel, pendant and bow. Case numbered.
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Diameter: 60 mm
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Signed: No name