English gold duplex made for the Chinese market Circa 1820

Gold, enamel and pearl pocket watch 
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An English 18K gold, pearl and painted-on enamel pocket watch with duplex escapement, circa 1820. The enamel is attributed to Hess, Geneva. Made for the Chinese market, circa 1820. An Empire case, the bezel, stem and bow set with split-pearls, hinged and sprung back cover with split-pearl border, dark blue guilloche enamel and engraved gold border. The shield-shaped central panel is finely painted with a scene of Abelard and Heloise, with a bow and hunting horn. Hinged and sprung gold cuvette. White enamel dial with radial Roman numerals and outer minute track, fleur-de-lys quarter hour markers, large subsidiary seconds and gold concave hands. Gilt Chinese calibre movement, foliate chased and engraved, hanging barrel, duplex escapement, polished steel five-arm balance, blued steel flat balance spring, diamond endstone, index regulator. Movement signed.
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Diameter: 60 mm
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Signed: Ilbery  London
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Some damage to the pearls.
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Little is known about the enamel painter Hess who is recorded at 42, Allemands – Dessous, Geneva, in 1828. His work is of extremely high quality and, his unsigned work has often been mistaken for the work of Jean-Louis Richter. The large almond-shaped eyes of the subjects seem to be an identifying feature of his work. A fine watch for the Chinese market.