Swiss 18k yellow and white gold dress watch Circa 1930

Gold open faced pocket watch
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A very fine and very thin Swiss, keyless, 18K yellow and white gold dress watch, circa 1930. A guilloché dial, gilt with engraved Breguet numerals on a plain reserve, outer minute track, subsidiary seconds dial. Gilt cathédrale hands. Straight-line lever escapement,19 jewels, cut bimetallic compensation balance with seven adjustments, blued steel flat balance spring. Dial, cuvette and movement signed.
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Diameter: 43 mm
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Signed: Gübelin  Lucerne