Swiss platinum, enamel and diamond dress watch Circa 1920

Platinum open faced lever dress watch
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A very fine and thin Swiss platinum, enamel and rose-cut diamond-set keyless dress watch, circa 1920. The back is overlaid with black enamel, bezel en suite, band and bow set with rose-cut diamonds, and winding crown set with a cabochon black onyx. Brushed silver dial, champlevé Breguet numerals, outer minute track, subsidiary seconds and blued steel Breguet hands. A rhodium-plated movement, Geneva striping decoration, stamped twice with the Seal of Geneva Quality Mark, 18 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 Fils  Genève