Swiss nickel plated lever precision pocket watch Circa 1913

Extremely accurate nickel plated chronometer watch by Golay Fils & Stahl
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A very fine, extremely accurate Swiss nickel plated keyless lever chronometer precision watch, circa 1913.  Rhodium plated 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, index regulator, wolf’s tooth winding. Dial signed, case and movement signed and numbered. Comes with original 1 ST class ‘bulletin de marche’ from the Observatoire de Genève on 8 December 1913 and the original National Physical laboratory in Teddington class Kew A certificate from 1 March 1914.
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Diameter: 54 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 December 1913 and then immediately submitted to the National Physical laboratory in Teddington where it obtained its Kew A certificate. Amazingly, all the documentation pertaining to these trials have been kept.