Fine Swiss 18K yellow gold keyless dress pocket watch Circa 1935

Gold open faced lever dress watch 
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A fine Swiss, 18K yellow gold, keyless, dress pocket watch, circa 1935. A polished case with a brushed silver dial, applied yellow gold faceted baton indexes, dots and Arabic quarter-hour numerals, outer dot minute divisions, subsidiary seconds. Yellow gold baton hands. A rhodium-plated movement, 18 jewels, straight-line lever escapement, uncut bimetallic compensation balance, flat balance spring, swan-neck micrometre regulator. Dial, case and movement signed.
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Diameter: 45 mm
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Signed: Patek Philippe  Genève
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The dial is slightly spotted.