Swiss/French miniature gold enamel pendant watch Circa 1820

Diamond set pendant watch with a corresponding chatelaine
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A Swiss/French decorative, diamond set miniature gold enamel pendant watch with a corresponding chatelaine, circa 1820.
Gold enamel case; the back lid engine-turned and translucent cobalt blue enamelled, applied diamond-set bouquet, florally engraved borders, reeded band, signed gold dome. Corresponding gold enamel chatelaine with signet and watch key. Enamel dial with radial Roman numerals and blued Breguet hands. Bridge movement, frosted, gilt and keywind, cylinder escapement and three-arm brass balance.
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Diameter: 23 mm
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Weight: 11 g
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Signed: Andrè Bruner à Genève / A. Daubrec à Nancy