Swiss sterling silver keyless lever pocket watch Circa 1910

Silver open faced pocket watch 
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A fine Swiss sterling silver and pink gold keyless pocket watch made by Patek Philippe, circa 1910. A polished case, pink gold hinges, collar and hand setting button. Hinged silver cuvette. White enamel dial with radial Arabic hours, outer minute track with red Arabic five minute numerals, sunk subsidiary seconds at 6 o’clock and pink gold spade hands. Gilt brass movement, 15 jewels, wolf’s tooth winding, straight line lever escapement à moustaches, cut bimetallic compensation balance, blued steel Breguet balance spring and index regulator. Dial, case, cuvette and movement signed.
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Diameter: 53 mm
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Signed: Patek Philippe & Cie.  Genève