Swiss pink gold quarter repeating verge pocket watch Circa 1820

Gold open faced verge watch
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A very fine and rare Swiss, quarter repeating, 18K pale pink gold pocket watch, circa 1820. A solid case, engine-turned case back and band, hinged gold cuvette. White enamel dial with Arabic numerals, outer minute track. Pale pink gold lozenge hands.
A full plate, gilt brass movement, fusée and chain, verge escapement, 3-arm brass balance, flat balance spring, pierced and chased cock, repeating on gongs by depressing the pendant. Dial, case and movement signed.
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Diameter: 49 mm
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Signed: Vacheron & Constantin  Genève