English duplex watch made for the Chinese market Circa 1800

Gold, enamel and half pearl-set duplex watch 
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An important and extremely fine English 18 carat gold, enamel and half pearl-set open faced centre seconds duplex pocket watch made for the Chinese market, circa 1800.
Gilt duplex movement, diamond endstone, large steel balance, blued regulator pointer.
Floral engraved cuvette with a fly spring mechanism. White enamel dial with Roman hours, outer minute divisions, Arabic quarter hours, 1/5 second register, centre seconds and original gold hands. The bezel is half pearl-set on both sides, the case back with polychrome enamel scene. Movement signed. Comes with the, probably, original key with a Chinese inscription.
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Diameter: 58 mm
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Weight: 146 g
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Signed: Ilbery London
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This watch has many similarities in details with the watch of Ilbery auctioned for over € 200.000 in 2006, Hongkong. The two watches are nearly identical from the case decoration to their bows and pendants. The same also applies to their movement, dial and hands. Only the painting is different but qualitatively comparable with the one here.