Lever with up and down and Guillaume balance Circa 1922

Silver open faced lever deck watch by Vacheron & Constantin
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A fine Swiss silver open faced keyless lever deck watch with up and down indication and Guillaume balance, circa 1922. Gilt finished lever movement, 21 jewels, large Guillaume balance with gold poising screws, micrometre regulator. Silver cuvette engraved Certificat de 1re Classe l’Observatoire Astronomique de Geneve. Matte silvered dial with Roman numerals, blued steel spade hands, aperture for 32 hours power reserve indicator and subsidiary seconds. Plain case. Case, cuvette, dial and movement signed.
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Diameter: 60 mm
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Signed: Vacheron & Constantin Genève