Rare Swiss gilt duplex watch for the Chinese market Circa 1850

Duplex watch with center seconds by Vaucher
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A rare Swiss gilt brass, enamel and split pearl set open faced duplex watch with center seconds made for the Chinese market, circa 1850. Polished steel movement, duplex escapement, glazed dust cover. White enamel dial with Roman numerals and center seconds. Large case with split pearl set bezels, pendant and bow, case back with opaque light green enamel ground centered by a painted polychrome bouquet of flowers. Movement signed.
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Diameter: 56 mm
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Signed: Vaucher Fleurier