French gold verge with concealed erotic scene Circa 1750

Gold erotic verge
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A very rare, early French 22-carat gold open faced verge pocket watch with a concealed erotic scene, circa 1750.
Full plate movement, chain/fusee, three armed steel balance. White enamel dial with Roman hours and Arabic minutes. Case elaborately engine turned, concealed painted on enamel erotic scene to the back, it is remarkable to find an early erotic scene of this size and artistic quality.
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Diameter: 46 mm
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Weight: 97 g
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Signed: No name