Swiss navette shaped ring watch with erotic scene Circa 1800

Gold, platinum, enamel and diamond set ring watch
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A fine Swiss gold, platinum, enamel and diamond set navette shaped keywound cylinder ring watch with concealed erotic scene, circa 1800. Keywound cylinder movement, chain fusée, visible diamond set balance wheel. White enamel dial with Roman numerals against the translucent blue enamel on engine turned ground. Navette shaped case, old cut diamond set bezel and shoulders, winding and hand set apertures concealed by a sliding cover with painted polychrome enamel erotic scene.
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Width: 19 mm
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Signed: No name