Swiss 18K gold enamel open faced pocket watch circa 1800

Gold and enamel open faced watch
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A very fine, rare gold enamel verge pocket watch “The Four Seasons” Case: gold enamel, engine-turned and translucid cobalt blue enamelled back cover with four polychrome enamel cartouches depicting four allegorical figures: the four seasons. Dial: enamel, Arabic numerals, paste-set Louis XV hands. Movm.: full plate movement, frosted, gilt, signed, blued screws, chain/fusee, solid movement pillars, verge escapement, three-arm brass balance, engraved, pierced balance bridge, large silver regulator disc.
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Diameter: 55 mm
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Weight: 95 g
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Signed: Leonard Bordier