Swiss 18 carat yellow gold keyless pocket watch Circa 1904

Gold open faced lever
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A very fine and rare Swiss 18 carat yellow gold open faced keyless pocket watch, circa 1904. A polished case, the back cover with engraved initial and a hinged gold cuvette. White enamel dial with Breguet numerals, outer minute track and Arabic five minute numerals, sunk subsidiary seconds and yellow gold Louis XV hands. Frosted gilt movement, patented bridge calibre, 21 jewels, wolf’s tooth winding, gold wheel train, straight line lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, Wilmot’s patented micrometric cam regulator. Dial, case, cuvette and movement signed.
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Diameter: 52 mm
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Signed: Patek, Philippe & Cie.  Genève
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Accompanied by a period Patek Philippe box and Certificate of Origin