English centre seconds duplex for Chinese market Circa 1840

Decorative gold, enamel and pearl set open faced watch by Just & Son
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An extremely fine, rare and decorative English 18 carat gold, enamel and pearl set open faced centre seconds duplex watch made for the Chinese market, circa 1840. Chinese calibre finely chased and engraved entirely floral and scroll decorated gilt finished movement, free standing barrel, ruby duplex escapement with ruby rest insert and steel impulse pallet. Engraved floral and scroll decorated gold cuvette. White enamel dial with Roman numerals and centre seconds. Case with pearl set bezel, rim, pendant and bow, alternating black and white champlevé enamel decorated band, back decorated with a polychrome enamel bouquet of flowers centred by two courting doves, made by using two different enamel techniques, champlevé and painted enamel. Movement signed and numbered, cuvette numbered.
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Diameter: 54 mm
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Signed: Just & Son London