French gold and enamel quarter repeating verge Circa 1760

Fine gold and enamel repeating verge by Jean Baptiste Ballion
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Fine French 18 carat gold and enamel open faced quarter repeating pocket watch, circa 1760. Gilt brass full plate movement with cylindrique pillars, fusee with chain, verge escapement. White enamel dial with Roman hours and Arabic minutes. Case pierces and engraved with polychrome enemal scene tot the back, called the portrait. Movement signed.
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Diameter: 45 mm
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Signed: B.te Ballion Paris