Slim Swiss gold and enamel jump hour watch Circa 1835

Gold jump hour pocket watch
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A fine, slim, 18K gold jump hour pocket watch with ramolayé and painted on enamel decoration, circa 1835. Lépine calibre, frosted gilt, four jewels, cylinder escapement, three-arm flat-rim gilt balance, blued steel flat balance spring, index regulator.
The case front cover with gold foliate ramolayé decoration against a black enamel ground, pendant and bow decorated with blue, white and black enamel, hinged and sprung back cover with a polychrome painted on enamel spray of flowers against a black ground and gold foliate border painted to resemble ramolayé. Hinged gold cuvette.
Silver dial, eccentric, engine-turned and foliate engraved, outer minute indexes and Arabic five-minute numerals, subsidiary seconds, jump-hour aperture above. Gold minute hand with a crescent tail.
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Diameter: 41 mm
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Signed: No name, Swiss, probably  Genève