Swiss pendant watch with gold long chain gold and enamel key Circa 1840

Lady’s pendant watch with jasper set gold fob
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A fine yellow gold and enamel hunting cased lady’s pendant watch with gold long chain, gold and enamel key and jasper set gold fob. Royal Blue Enamel Switzerland, made circa 1840. Two body and bassine case, both covers overlaid with royal blue translucent enamel over engine-turning, decorated with gold and silver paillons, flower and scroll chased gold borders, pendant and bow.
White enamel dial with radial Roman numerals, outer minute track, winding aperture at 2 o’clock and gold Breguet hands. Matte gilt and full plate movement with fusee and chain, verge escapement with micrometric potence adjustment, three arm balance, flat balance spring, pierced and engraved continental cock with polished steel endplate and a silver regulation dial.
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Diameter: 38 mm