Swiss gold open faced keywinding pocket watch Circa 1840

Gold lever with an escutcheon on the case back
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A Swiss 18 carat yellow gold open faced keywinding pocket watch, made by Duchene & Fils in Geneva, circa 1840. An engine turned case back with, in the centre, an escutcheon, also an engine turned case band with a gold cuvette. White enamel dial with radial Roman numerals, subsidiary seconds at 6 and blued steel Spade hands. A gilt brass movement, going barrel, straight line equilibrated lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator. Signature on the cuvette.
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Diameter: 46 mm
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Weight: 70 g
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Signed: Duchene & Fils, Geneva