Swiss multi-color gold and portriait cylinder watch Circa 1780

Gold and enamel cylinder pocket watch
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A French cylinder in a stone set multicolor gold and enamel consular case, circa 1780, full plate gilt fusee movement. Finely pierced and engraved bridge cock with steel coqueret, plain three arm gilt balance with blue steel spiral hairspring. Silver regulator dial with blue steel indicator. Round pillars. Polished steel cylinder and large brass escape wheel. Winding through the white enamel dial, black Roman numerals and Arabic outer, decorative silver hands. multi-color gold consular case with polychrome enamel portrait of a young lady on the back., stones surrounding the portrait, gold pendant and bow.
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Diameter: 40 mm
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Weight: 49 g
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Signed: Veigneur à Geneve
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These kinds of portrait watches normally have a verge escapement, cylinder escapement is unusual.
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Reference 0020000