Rare Swiss 18k gold cylinder pocket watch Circa 1850

Gold open faced watch 
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A Fine and rare, 18K gold pocket watch, circa 1850. A solid, reeded band, case back engraved in a floral pattern, in the centre the portrait of a gentleman, hinged gold cuvette with engine-turned border. White enamel dial with Roman numerals, blued steel Breguet hands. Movement, frosted gilt, bridge calibre, 8 jewels, cylinder escapement, three-arm brass balance, blued steel flat balance spring. Cuvette and movement signed.
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Diameter: 43 mm
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Signed: Czapek & Cie.  Genève