Swiss rare gold watch with virgule escapement Circa 1800

Open faced pocket watch by Frères Melly, Genève
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An extremely rare gold and enamel Swiss pocket watch with virgule escapement, circa 1800.
Very flat 18 carat gold case with enameled back, a finest painting of a man with his wife and child walking in the field and signed FM 5979; extremely flat caliber with virgule escapement; white enamel dial with Roman numerals and blued Breguet steel hands.
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Diameter: 53 mm
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Weight: 80 g
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Signed: FM ( Frères Melly)