Swiss gilt metal verge with concealed erotic scene Circa 1780

A Swiss gilt metal key wind pocket watch with later concealed erotic scene by Cugnier, circa 1780. Gilt full plate fusee verge movement, pierced and engraved balance bridge, silver regulation. White enamel dial, black Arabic numerals, outer minute track, winding aperture at 2, gilt beetle and poker hands. Pair cased, later gilt consular with blue enamel outer and studded bezel (AF), concealed erotic scene of a nun to cuvette. Dial and movement signed.
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Diameter: 53 mm
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Signed: Cugnier