Swiss platinum open faced keyless dress watch Circa 1925

Gold open faced lever pocket watch 
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A very fine and rare Swiss, keyless, platinum dress watch, circa 1925. Sold on January 9th, 1928. Accompanied by an Extract from the Archives. A solid, polished case, winding crown set with a cabochon ruby. Matte silver dial with applied Arabic numerals and baton indexes, outer minute track, subsidiary seconds dial. White gold feuille hands. A rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, micrometre regulator. Dial, case and movement signed.
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Diameter: 43 mm
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Signed: Patek Philippe & Cie.  Genève
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The movement is oxidized and the dial has some replacements.