Swiss 18 carat gold watch with 14 carat gold chain Circa 1915

Gold open faced lever watch
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A fine Swiss, keyless, open faced 18 carat gold pocket watch with 14 carat gold chain, circa 1915. 18-Jewel nickel finished movement with counterpoised lever escapement, eight adjustments, bimetallic balance with overcoiled spring.
Gilt dial with Arabic chapters enclosing a guilloché centre, blued Breguet hands, subsidiary seconds. Concealed hinge case engraved with lozenge monogram, with a slender 14K gold chain of alternating loop and bar links, case, dial and movement signed.
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Diameter: 444 mm
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Signed: Patek Philippe Geneva Switzerland