Swiss 18 carat gold keyless lever chronograph watch Circa 1911

Gold open faced keyless lever chronograph watch
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A Swiss gold open faced keyless lever chronograph watch, circa 1911, damascened nickel lever movement, bimetallic compensation balance, precision regulator.
White enamel dial, Arabic numerals, outer scale for 1/5th second, subsidiary dials for 30 minute register and constant second, gold case with push button on the winder, bolt device for locking the chronograph, initials on the back, case, dial, movement and pendant signed.
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Diameter: 50 mm
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Signed: Patek Philippe & Cie Geneva
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Extract from the Archives confirming date of sale in 1923.