Swiss pocket watch with corresponding necklace Circa 1820

Gold enamel hunting cased pocket watch by Vacheron & Constantin
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A fine, thin Swiss gold enamel pocket watch with corresponding gold enamel necklace (length 440 mm), circa 1820.
Gold enamel case with floral decoration, the back cover, the bezel and the pendant decorated with polychrome champlevé enamel against an opaque black enamelled background and signed and numbered gold dome. Silver engine-turned dial with radial Roman numerals and Breguet hands. Bridge movement, keywind, frosted, gilt, with cylinder escapement and three-arm brass balance.
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Diameter: 39 mm
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Weight: 38 g
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Signed: Vacheron & Constantin à Genève