Swiss 18 carat gold open faced lever pocket watch Circa 1912

Gold open faced pocket watch by Patek Philippe
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A Swiss 18 carat gold open faced pocket watch, circa 1912, 18″‘ movement, inscription to the gold cuvette.
Gilt dial with guilloché center, Breguet numerals to the matte chapter ring and subsidiary seconds.
Engraved monogram to the case back. Case, dial and movement signed.
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Diameter: 46 mm
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Signed: Patek Philippe & Cie Geneve
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With Certificate of Origin confirming monogram, Extract from the Archives confirming sale with monogram in 1913, original box and spare numbered crystal.