French enamel quarter repeating triple cased gold verge Circa 1780

Triple colour gold and enamel open faced repeating verge
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A very fine French 18 carat triple colour gold, enamel and simulated tortoiseshell triple cased key wind repeating open faced pocket watch, circa 1780. Gilt full plate fusee verge, pierced and engraved balance cock, silvered regulation.
White enamel dial with black Roman numerals, black outer minute track with Arabic numeral 5-minute markers, fancy stone set hands. Case polished and pierced gold inner with a winding hole to back, tri-colour gold second case with polychrome enamel female portrait within green enamel border, simulated tortoiseshell covered gilt third case. Signed movement and dust cap.
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Diameter: 53 mm
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Signed: Esquivillon et de Choudens à Paris
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Esquivillon et de Choudens à Paris 1765-1830.