Swiss platinum cased keyless dress pocket watch Circa 1918

Platinum lever dress pocket watch 
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A fine Swiss, platinum cased, keyless, dress pocket watch, circa 1918. A polished case. Engine-turned silver dial with central guilloche, heavy black enamelled Roman numerals within a plain chapter, outer minute track, subsidiary seconds. Blued steel Breguet hands. A rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic balance, eight adjustments, Breguet balance spring. Signed on the dial and movement.
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Diameter: 46 mm
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Signed: Patek Philippe & Co.  Genève