Elegant gold perpetual calendar with moon phases Circa 1920

Yellow and white gold open faced complicated watch by Gübelin
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A fine and elegant Swiss 18 carat yellow and white gold open faced perpetual calendar keyless lever watch with moon phases, circa 1920. Nickel finished jewelled lever movement, bimetallic compensation balance. Silvered matte dial, applied gold Arabic numerals, four subsidiary dials for month and leap year, day, date and moon phases with lunar calendar and constant seconds. Plain case with yellow gold band, white gold bezel and pendant, snap on back embossed with the initials ‘KHL’. Case, dial and movement signed.
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Diameter: 46 mm
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Signed: E. Gübelin Lucerne