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

Gold open faced lever by Patek Philippe
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A fine Swiss, 18K yellow gold, keyless, dress pocket watch, circa 1935. Brushed silver dial with applied yellow gold faceted baton indexes, dots and Roman quarter-hour numerals, outer dot minute divisions, subsidiary seconds. Yellow gold baton hands.
A rhodium-plated movement, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance adjusted to heat, cold, isochronism and five positions, movement stamped twice with Geneva quality mark, 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