French 18k gold lever dress watch with long chain Circa 1915

Gold and enamel open faced lever watch by Cartier
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An elegant, thin French 18 carat gold and enamel open faced keyless lever dress watch with a fine 18 carat gold and enamel long chain, circa 1915. Rhodium plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance with 8 adjustments, blued steel flat balance spring, index regulator. Matte silver dial, sunburst engine turned with dauphine numerals, outer minute track, subsidiary seconds and original blued steel Breguet hands. Case with knife edge band, the back with central red and white enamel geometric monogram, wide polished bezel. Dial and movement signed, case numbered.
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Diameter: 46.5 mm
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Signed: Cartier Paris