Swiss platinum keyless open faced lever watch Circa 1938

Platinum pocket watch
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A Swiss platinum open faced keyless pocket watch made by Patek Philippe in Geneva, circa 1938. The lever movement with 18 jewels. Silvered dial with applied platinum bullet indexes, outer dot minute divisions, subsidiary seconds at 6 o’clock and dauphine hands. The smooth case with a snap-on back. Dial, case and movement signed.
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Diameter: 43 mm
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Signed: Patek, Philippe & Cie Genève