French gold, enamel triple cased verge pocket watch Circa 1780

Gold and enamel triple cased verge pocket watch
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A French verge in gold and enamel pair cases and glazed protective outer, circa 1780. Full plate fire gilt movement with pentagonal baluster pillars. Pierced and engraved cock, pierced and engraved foot and plate for the silver regulator disc. Fusee and chain. Plain three arm gilt balance, blue steel spiral hairspring. White enamel dial with Roman and Arabic numerals, pierced gilt hands. Plain gold inner case with gold pendant and bow, circular gilt shutter to the winding aperture fitted internally, a slot cut to allow it to be moved. Gold outer case, the bezels engraved and decorated with champleve enamel. The back set with a fine polychrome enamel portrait of a young lady. Third protective outer case with glazed back, the covering to the gilt bezels now lacking.
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Diameter 45 mm
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Signed: Les Frs Esquivillion et DeChoudens