Swiss platinum keyless pocket watch with sapphires circa 1930

Platinum lever watch with open face by Patek Philippe
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A fine, rare, manual wind Swiss platinum pocket watch with sapphires, circa 1930.
Nickel finished lever movement, 18 jewels, bimetallic compensation balance, wolf’s tooth winding. Silvered dial with Arabic numerals, outer minutes track, and blued spade hands. Case chased, engraved and ornamented with sapphires cabochon set crown and case band. Case, dial and movement signed.
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Diameter: 44 mm
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Signed: Patek Philippe & Cie Geneva Switzerland