Swiss platinum and diamond set keyless watch Circa 1945

Platinum lever pocket watch by Patek Philippe
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A Swiss platinum and diamond set open faced keyless lever watch, circa 1945. Nickel finished lever movement, 18 carat jewels.
Silvered matte dial, five minutes with diamonds, subsidiary dial for constant seconds. Platinum, snap-on case back engraved with “J.C.S”, Case, dial, and movement signed, case and movement numbered.
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Diameter: 43 mm
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Signed:Patek, Philippe & Cie Genève
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Patek Philippe Extract from the Archives confirming production of this watch with silvered dial and diamond hour-markers in 1945 and its subsequent sale in 1946.