Swiss 18k gold open faced lever pocket watch Circa 1913

Gold keyless lever by Patek Philippe
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A  yellow gold open faced pocket watch, circa 1913. Gilt-finished lever movement, bimetallic compensation balance, wolf’s tooth winding, white dial, painted black radial Roman numerals, blued steel hands, subsidiary seconds at 6, outer minute track, 18k yellow gold case, hinged case back, case, dial, cuvette and movement signed.
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Diameter: 48.5 mm
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Signed: Patek, Philippe & Cie Geneva Switzerland
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Accompanied by an Extract from the Archives confirming manufacture in 1913 and sale on January 27th, 1914. Together with a Patek Philippe presentation box.