Fine Swiss gold and enamel cylinder watch Circa 1840

Gold open faced cylinder watch
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A Swiss fine gold Vacheron Constantin decorative watch, circa 1840. Gilded brass movement, with going barrel, cylinder escapement, monometallic balance (probably in gold) and blued steel flat hairspring.
18K yellow gold and enamel, open faced case, keywind, round-shaped, pocket watch; silver guilloché engine-turned dial Case back and bezel engraved and polychrome enamelled in champlevé with decoration of friezes and foliage. Signed cuvette.
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Diameter: 41.5 mm
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Signed: Vacheron Constantin