Swiss gold and enamel open-faced watch Circa 1740/1830

Pink gold and enamel open-faced watch 
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A pink gold and enamel open-faced watch circa, 1740 and 1830, gilt full plate movement circa 1740 with cylindrical pillars, fusee and chain, verge escapement, plain three-arm balance, pierced and engraved balance bridge, silver textured dial, Roman numerals, pink gold case circa 1830, the front with black and white champlevé enamel foliate and floral decoration, matching enamel decoration to the case back and bow, case numbered.
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Diameter: 43 mm
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Signed: No name