Elegant Swiss thin Art Deco gold pocket watch Circa 1920

Art Deco pocket watch with perpetual calendar
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A very fine and rare elegant and thin Art Deco keyless 18 Carat yellow and white gold pocket watch with perpetual calendar and moon phases. Retailed by E. Gübelin, Lucerne Circa 1920. Three body solid demi bassine polished case with a white gold band, yellow gold bezel, yellow gold back with white gold border and applied Art Deco monogram HLK.
Silver dial with applied yellow gold Arabic numerals, outer minute track, subsidiary dials for the months and four-year cycle, days of the week, date and seconds, aperture for the moon phases and yellow gold cathedral hands. Rhodium plated movement with Geneva striping decoration, 21 jewels, straight-line lever escapement, cut bimetallic compensation balance with 8 adjustments, self-compensating blued steel Breguet balance spring and an index regulator.
Dial and movement signed by the retailer and case numbered.
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Diameter: 44 mm
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Signed: E. Gübelin, Lucerne