Swiss 18 carat yellow gold keyless pocket watch Circa 1915

Gold hunting cased lever 
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A fine Swiss 18 carat yellow gold hunting cased keyless pocket watch, circa 1915.
A solid plain case, white enamel dial features black Arabic numerals and a subsidiary seconds dial at 6 o’clock, accompanied by blued steel hands. Frosted gilt movement, 15 jewels, wolf’s tooth winding, straight line lever escapement à moustache, cut bimetallic compensation balance, blued steel flat balance spring. Dial, case and movement are signed.
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Diameter: 48 mm
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Signed: Patek Philippe & Cie.   Swiss