Swiss silver and enamel keyless pendant watch Circa 1920

Silver lever with a sapphire winding crown
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A fine Swiss, silver and enamel, keyless pendant watch, circa 1920. The bezel and back are overlaid with blue translucent guilloché enamel, white enamel line borders, and a cabochon sapphire-set winding crown. Matte silver dial with Arabic numerals, outer minute track. Steel hands. A rhodium-plated movement, Geneva striping decoration, 15 jewels, straight-line lever escapement, cut-bimetallic compensation balance with three adjustments, blued steel flat balance spring, and an index regulator. Movement signed.
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Diameter: 28 mm
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Signed: Mido  Swiss