French 18K gold quarter repeating pocket watch Circa 1830

Gold duplex pocket watch
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A French 18 carat yellow gold open faced key winding pocket watch, made by S. Devaux in Paris, circa 1830. An engine turned case back, with, in the center a circle, engraved in fine cut with the cypher JS and a fluted case band. One horological complication: Quarter repeater by two hammers on two steel gongs, activated by the slide located on the case band at 1 o’clock. White enamel dial with radial Roman numerals, outer minute track, subsidiary seconds at 6 and yellow gold Breguet hands. A gilded brass movement, going barrel, duplex escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator; repeater work on the main plate, under the dial. Signature on the cuvette.
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Diameter: 47 mm
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Weight: 71 g
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Signed: S. Devaux, Paris