Swiss platinum and diamond dress pocket watch Circa 1929

Platinum keyless lever dress watch
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An unusual, elegant Swiss platinum and diamond keyless dress pocket watch, circa 1929. A polished and brushed case, the band on the bow and case set with diamonds, diamond-set crown, the case back engraved J.C.J. Brushed silver dial with applied gold Breguet numerals and gold spade hands. A rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement with antenna compensation, cut bimetallic balance, adjusted to heat and cold, isochronism and five positions, Breguet balance spring, index regulator. Dial, case and movement signed.
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Thickness: 7 mm
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Diameter: 43 mm
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Signed: Patek Philippe & Co.  Genève
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The movement plating has deteriorated.