Swiss 18k gold keyless dress watch with black dial Circa 1950

Gold open faced lever dress watch
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A very fine and unusual Swiss 18K yellow gold keyless dress watch with a black dial. Accompanied by the Extract from the Archives, circa 1950. Bassine polished and brushed, inclined bezel. Black dial with applied yellow gold faceted bâton indexes, outer minute track, subsidiary seconds. Yellow gold Dauphine hands.

Rhodium-plated movement, Geneva striping decoration, 17 jewels, stamped twice with the Seal of Geneva Quality Mark, straight-line lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, swan-neck micrometre regulator. Dial, case and movement signed.
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Diameter: 44 mm
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Signed: Patek Philippe & Co. Genève