Swiss 18K gold lever watch with matching chain Circa 1820

Gold open faced with an engraved floral motif
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A very fine Swiss, 18K gold lever pocket watch with matching chain, circa 1820.
The case band reeded, the bezels with an engraved floral motif, and the back with engraved flowers around grapes. White enamel dial, radial Roman numerals, outer minute divisions. Blued steel Breguet hands. A gilt movement, lever escapement, three-arm brass balance, flat balance spring, index regulator. Case signed.
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Diameter: 36 mm
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Signed: Louis Duchène & Fils  Genève
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The movement is oxidized.