Swiss gold/enamel open faced cylinder watch Circa 1850

Gold open faced cylinder pocket watch 
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A lady’s exquisite, thin Swiss gold enamel pocket watch with cylinder escapement, circa 1850.
An 18 carat gold, polychrome enamel pocket watch, enamel dial, bridge movement, three arm brass balance.
This pocket watch stands out because of the excellent quality of the case and the fine polychrome enamelling, showing a mountain motif with a Swiss lake and staffage figures.
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Diameter: 32 mm
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Weight: 19 g
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Signed: No Name