Fine Swiss silver keyless lever chronometer watch Circa 1914

Silver keyless lever chronometer watch
–
Very fine, extremely accurate Swiss silver keyless lever chronometer watch, circa 1914. Rhodium plated movement, fausses côtes decoration, 21 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 and movement signed, case signed and numbered. Comes with original 1 ST class ‘bulletin de marche’ from the Observatoire de Genève on 5 June 1914 and the original National Physical laboratory in Teddington class Kew A certificate from 30 July 1914.
–
Diameter: 52 mm
–
Signed: Golay Fils & Stahl Genève
–
This Chronometer was submitted successively at the Geneva observatory where it obtained a bulletin de marche for first class category from June 1914 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