Outstanding quality French gold and enamel watch Circa 1781

Gold open faced verge pocket watch  
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A French gold enamel verge pocket watch, circa 1781.
An 18 carat gold, enamel case, enamel dial, arabic numerals, decorative hands, full plate movement, chain/fusee, three-arm brass balance.
An extremely charming, thin pocket watch of outstanding quality; the back is decorated with cobalt blue enameling on engine turned pattern and a central medallion with en grisaille painting: Alexander the Great meets Clio, the muse of history. The bezels on both sides are decorated with opalescent white enamel foliage and gold paillon tendrils on a cobalt blue ground. The pendant is similarly ornamented.
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Diameter: 51 mm
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Weight: 94 g
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Signed: Philippe Borel  Paris
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Tardy’s “Dictionnaire des Horlogers Francais” lists Philippe Borel as active in Paris in 1781, where he worked for Abraham-Louis Breguet.