Rare English verge made for the Chinese market Circa 1780

Gold, enamel, agate and diamond set centre seconds stop watch by John Ilbery
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Very fine, rare and unusual English gold, enamel, agate and diamond set pair cased open faced manually wound centre seconds stop watch made for the Chinese Market, circa 1780. Full plate gilt finished verge movement, chain fusee, finely pierced and engraved balance cock and foot, diamond endstone, metal dust cap. White enamel dial with Roman numerals, outer Arabic five minute divisions and centre seconds stopped/started by a lever in the bezel. Plain inner case, outer gold and turquoise, polychrome enamel floral decorated bezel, agate set back, diamond set thumbpiece. Movement and dust cap signed, inner case stamped ‘RP’ and with London date letter for 1780.
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Diameter: 63 mm
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Signed: John Ilbery London