Swiss 18 carat gold and decorated enamel pocket watch Circa 1800

Gold open faced verge pocket watch
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A fine Swiss 18K gold and enamel open faced verge pocket watch, circa 1800. Pierced wide flat band decorated with translucent blue enamel triangles with gold paillons and white enamel dots and border, engine-turned back, hinged bezel. White enamel dial with radial Roman numerals, outer minute track and gilt Breguet hands. A matte gilt, full plate movement, turned pillars, fusee and chain, verge escapement with micrometric potence adjustment, three-arm brass balance, flat balance spring, continental cock with polished steel endplate, silvered regulation dial. Movement signed. 
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Diameter: 51 mm
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Signed: Humbert Bliet Swiss
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The case is slightly chipped.