Swiss miniature ball shaped pendant watch Circa 1800

Gold enamel form pendant watch with original key
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A fine, rare Swiss miniature ball shaped pendant watch with original watch key, circa 1800.
Gold, engine turned and translucent cobalt blue enamelled case with white and gold champlevé enamel decoration: a spray of flowers on a black enamelled ground and a white enamelled banner: “Elle est pour toi Sans Epine” (“It is for you without thorns”). Enamel dial with Arabic numerals and Breguet hands. Full plate movement, keywind, gilt, with chain/fusee, solid movement pillars, verge escapement, three-arm brass balance and engraved, pierced balance bridge.
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Diameter: 25 mm
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Weight: 20 g
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Signed: No name