French gold slim dress watch with jumping digital hours Circa 1930

Gold open faced lever by Cartier
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A fine French, 18k yellow gold, keyless slim dress watch with jumping digital hours, circa 1930. A solid, polished case with a silver dial, engine-turned, black painted Arabic five-minute numerals, outer minute track, and aperture for the jumping hours. Black steel single arrow hand. A rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic balance, eight adjustments, and Breguet balance spring. Dial, case and movement signed.
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Diameter: 45 mm
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Signed: Cartier  Paris
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Some dents on the case.