Swiss platinum open faced keyless dress watch Circa 1940

Platinum case with silver dial and white gold hands
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A fine Swiss platinum keyless dress pocket watch, circa 1940. Accompanied by the Extract from the Archives. A polished and brushed case. Satine silver dial with applied white gold Breguet numerals, outer minute track, subsidiary guilloche sunk seconds dial and white gold feuille hands. Rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance adjusted to heat, cold, isochronism and five positions, blued steel Breguet balance spring, swan-neck micrometre regulator. Dial, case and movement signed.
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Diameter: 43 mm
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Signed: Patek Philippe & Cie.  Genève