Swiss gilt metal and enamel open faced verge watch Circa 1780

A Swiss gilt metal and enamel open faced key wind pocket watch, circa 1780. Gilt full plate movement with fusee verge escapement, pierced and engraved balance bridge, silver regulation.
White enamel dial with black Arabic numerals, black outer minute divisions with Arabic numeral 15-minute markers, winding aperture at 2, fancy stone set hands.
Hinged consular case, blue enamel reverse depicting a courting couple and a water fountain, decorative bezels.
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Diameter: 51 mm
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Signed: Probably Swiss