Fine Swiss 18K yellow gold lever pocket watch Circa 1910

Gold open faced keyless pocket watch
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A very fine and rare Swiss 18K yellow gold keyless pocket watch, circa 1910. A polished case, concealed hinge, hinged gold cuvette. White enamel dial with heavy Roman numerals, outer minute track, subsidiary seconds dial and blued steel Breguet hands.
A matte gilt brass movement, 15 jewels, wolf’s tooth winding, straight-line moustache lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, index regulator. Dial, case, cuvette and movement signed.
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Diameter: 50 mm
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Signed: Patek, Philippe & Cie.  Genève