English 18k gold and enamel watch with chatelaine Circa 1800

Gold watch with matching detachable chatelaine
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A very rare English, 18k gold, enamel, diamond and pearl-set pocket watch, circa 1800. With matching detachable 29 cm long (total) gold, enamel and pearl chatelaine with key and seal. The bezel with blue enamel and split pearls is set within gold chatons, matching outer reverse to royal blue enamel centre with diamond set circular wreath, central oval blank glazed compartment with a diamond border. White enamel dial, black Roman numerals, outer minutes, winding aperture. Full plate, gilt movement, engraved top plate, turned pillars, fusee barrel with verge escapement, pierced and engraved single-footed cock with diamond end-stone, steel three-arm balance, flat hairspring, silver regulation dial. Movement signed and numbered.
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Diameter: 46 mm
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Signed: Moryset & Lurkins  London
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The case is chipped.