French 18k gold open faced verge pocket watch Circa 1780

Gold, enamel and rose-cut diamond pocket watch
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A very fine French, 18k gold, enamel and rose-cut past-set diamond pocket watch, circa 1780. Reverse with royal blue enamel over engine-turning, outer paste-set the bezel to front and reverse numbered bow. White enamel dial, black Roman numerals, outer minutes with quarter numerals, winding aperture at 2. Gold spade hands. A hinged, gilt full-plate movement with tapered cylindrical pillars, fusee and chain, verge escapement, brass balance with flat balance spring, pierced and engraved continental cock with metal end-piece, regulator dial. Signed on the movement and dial.
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Diameter: 47 mm
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Signed: Charles Le Roy  Paris
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Missing some stones, the dial has a chipped winding aperture and replaced hands.