Swiss 18K pink gold keyless pocket watch Circa 1900

Gold open faced lever pocket watch
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A fine and rare Swiss 18K pink gold keyless pocket watch, circa 1900. The back with an engraved foliate monogram. Hinged gold cuvette engraved 15 August 1902. White enamel dial with radial Roman numerals, outer minute track with five-minute Arabic numerals, subsidiary seconds and blued steel spade hands. A gilt brass movement, patented bridge calibre, 17 jewels, wolf’s tooth winding, straight line moustache 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: 51.5 mm
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Signed: Patek, Philippe & Co  Genève