Swiss gold and champlevé enamel dress watch Circa 1920

Gold and enamel keyless lever watch
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A very fine and rare thin Swiss 18K gold and champleve enamel keyless dress pocket watch, circa 1920. The back decorated with champlevé enamel in a millefiori type pattern on a black ground, bezel en suite, band and bow in champlevé enamel in a geometric pattern, winding crown set with a cabochon black onyx.
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Matte gilt dial, champleve Breguet numerals, outer minute track, subsidiary seconds. Blued steel hands. Rhodium-plated movement, Geneva striping decoration, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance with blued steel flat balance spring, index regulator. Dial, case and movement signed.
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Diameter: 43 mm
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Signed: Wegelin  Genève