Swiss silver open faced lever chronometer pocket watch Circa 1920

Silver watch in a fitted mahogany box
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A very fine Swiss, silver and gold, keyless, lever chronometer pocket watch, circa 1920. Bulletin de Marche du Bureau de Controle de l’Etat de Geneve and a fitted mahogany box. A polished case, gold hinges and thumb-piece. Hinged silver cuvette. White enamel dial, three-piece, Breguet numerals, outer minute track, subsidiary seconds. Blued steel Breguet hands.
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A frosted gilt movement, 20 jewels, wolf’s tooth winding, stamped twice with the Seal of Geneva Quality Mark, straight-line lever escapement, cut bimetallic compensation balance with peripheral gold temperature and meantime adjustment screws, blued steel Breguet balance spring, index regulator. Dial and movement signed.
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Diameter: 50 mm
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Signed: Mario Marocco  Geneve
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Seal of Geneva Quality Mark. The Seal of Geneva Quality Mark is a trademark of the Office of Geneva Control of Watches. It was established on November 6, 1886, amended several times with the largest change incorporated on December 10, 1955. Its function was to voluntarily control watches made in the Canton of Geneva. Paragraph three of the statutes state that the watches awarded the Seal of Geneva Quality Mark must after examination prove to have a perfect mechanism to ensure regular and durable functioning.