Swiss stainless steel open faced lever watch Circa 1920

Keyless lever by Patek Philippe & Co.
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A Swiss stainless steel open faced keyless lever watch, circa 1920. It features a nickel finished lever movement with 18 jewels, a bimetallic compensation balance, and a swan neck regulator. The silvered matte dial includes applied stainless steel baton and Arabic numerals, with an engine turned subsidiary seconds display. It has a plain case with a snap on back. The case, dial, and movement are all signed.
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Diameter: 45 mm
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Signed: Patek Philippe & Cie Genève
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The movement is in working condition. The dial shows signs of oxidation due to ageing, especially towards the edges, visible to the naked eye. The case exhibits signs of surface wear throughout. Overall, the watch is in very good condition considering its age.