Swiss yellow gold open faced lever watch with Circa 1890

Gold open faced keyless lever watch
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A Swiss yellow gold open faced keyless lever watch with enamel dial, circa 1890, manual winding nickel lever movement, cut bimetallic compensation balance.
White enamel dial, Roman numerals, inner minute track and Arabic minute markers, subsidiary seconds, 18k yellow gold case, foliage engraving to case back and a blue enamel coat-of-arm • case, dial and movement signed.
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Diameter: 31 mm
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Signed: Vacheron Constantin Genève