French yellow gold keyless dress watch Circa 1920

Gold lever dress watch
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A rare, thin French 18 Carat yellow gold keyless dress watch, circa 1920. A polished case, the back with an engraved monogram. Matte silver, sunray engine-turned dial, black radial Roman numerals, outer minute track and blued steel Breguet hands. A  rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance with eight adjustments, blued steel Breguet balance spring, and micrometric regulator. Dial and movement signed, case numbered and punched EJ for Edmond Jaeger.
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Diameter: 43 mm
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Signed: Cartier  Paris
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Accompanied by a period Cartier gold tooled green morocco box.