Extremely accurate Swiss nickel plated chronometer Circa 1909

Nickel plated chronometer by Golay Fils & Stahl
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Very fine, extremely accurate Swiss nickel plated keyless lever chronometer watch, circa 1909. Rhodium plated movement, 21 blue sapphire jewels, straight line lever escapement, Guillaume compensation balance with gold temperature and meantime adjustment screws, blued steel Breguet balance spring with a terminal curve, swan neck micrometre regulator, wolf’s tooth winding. Dial signed, movement signed and numbered. Comes with the original 1 ST class bulletin de Marche from the Observatoire de Genève on 24 November 1909 June and the original National Physical laboratory in Richmond class Kew A certificate from 30 January 1910.
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Diameter: 52 mm
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Signed: Golay Fils & Stahl Gèneve
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This chronometer was submitted successively at the Geneva Observatory. It obtained a bulletin de marche for the first class category from November 1909 and then immediately submitted it to the National Physical Laboratory in Richmond, where it received its Kew A certificate. Amazingly, all the documentation about these trials has been kept.