Swiss verge with hidden erotic enamel painting Circa 1820

Gilt metal verge pocket watch
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A gilt metal verge watch, extremely rare hidden erotic enamel painting, circa 1820.
Extremely rare, very fine painting, extremely rare scene of stallion, mare and woman, fine scratches and fine craquelling.
Fire-gilt verge movement, original enamel dial, golden hands, movement and dial are signed, rubbed section near winding shaft.
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Diameter: 52 mm
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Signed:  Amalric Frères  Genève