Extremely accurate Swiss silver lever chronometer Circa 1911

Silver chronometer by Golay Fils & Stahl
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Very fine, large and extremely accurate Swiss silver keyless lever chronometer watch, circa 1911. Gilt brass movement, 19 blue sapphire jewels, straight line lever escapement, Guillaume compensation balance with gold temperature and meantime adjustment screws, blued steel Breguet balance spring with terminal curve, swan neck micrometer regulator, wolf’s tooth winding. Dial signed, movement signed numbered. Comes with original 1 ST class bulletin de marche from the Observatoire de Genève on 10 January 1912 and the original National Physical laboratory in Richmond class Kew A certificate from 29 February 1912.
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Diameter: 58 mm
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Signed: Golay Fils & Stahl Genève
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This Chronometer was submitted successively at the Geneva observatory where it obtained a bulletin de marche for first class category from January 1912 and then immediately submitted to the National Physical laboratory in Richmond where it obtained its Kew A certificate. Amazingly, all the documentation pertaining to these trials.