Swiss plain silver open faced verge pocket watch Circa 1820

Silver verge by Vacheron & Constantin
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A Swiss silver open faced verge pocket watch, circa 1820. Full plate movement with verge escapement. White enamel dial with Roman numerals and rose gold hands. Plain case, gilt cuvette. Case and movement with matching number, dome, signed and numbered, dial and movement signed.
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Diameter: 52 mm
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Weight: 98 g
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Signed: Vacheron & Constantin a Geneve
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One of the earliest known pocket watches from Vacheron & Constantin with verge movement.