Swiss 18 carat yellow gold keyless pocket watch Circa 1915

Gold open faced lever pocket watch
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A very fine Swiss, keyless, 18K yellow gold pocket watch, circa 1915. A solid, polished case, hinged gold cuvette with an engraved list of dates. White enamel dial with Arabic numerals, outer minute track, subsidiary seconds dial. Blued steel Breguet hands. A frosted gilt movement, stamped twice with the Seal of Geneva Quality Mark,18 jewels, wolf’s tooth winding, straight-line lever escapement, cut bimetallic compensation balance with temperature and meantime adjustment screws, blued steel Breguet balance spring, index regulator. Dial, cuvette and movement signed.
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Diameter: 50 mm
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Signed: Adrien Rigacci  Genève
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Seal of Geneva Quality Mark is a trademark of the Office of Geneva Control of Watches, was first established on November 6, 1886, to control watches made in the Canton of Geneva. Watches awarded the Seal of Geneva Quality Mark must after examination prove to have a perfect mechanism to ensure regular and durable functioning.
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Adrien Rigacci made only three movements under his own name at the Ecole d’Horlogerie. Only one of them – the present watch – was cased. For the remainder of his career, Rigacci worked at Patek Philippe.