French gold watch with enamel “en grisaille” painting Circa 1800

Gold open faced pocket watch by Breguet
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A French decorative big 18 carat gold verge watch with rare “en grisaille” enamel painting, circa 1800.
Decorative pink gold and green gold case, high-grade 5-part lateral hinge, fine “en grisaille” painting on back, very detailed, precise painting, white and blue rim. Fire gilt, signed verge movement. Signed white enamel dial with Roman hours, Arabic minutes and probably original hands.
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Diameter: 53 mm
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Weight: 79 g
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Signed: Breguet a Paris