French 18K yellow gold extra thin dress watch Circa 1920

Gold open faced lever pocket watch
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A very fine and rare French, extra thin 18K yellow gold keyless dress watch, circa 1920. A polished case, coin-edge band and bow. Matte silver dial with bold black radial Roman numerals, outer minute divisions. 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, micrometric regulator. Dial, case and movement signed. Property of a Japanese Gentleman.
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Diameter: 44.5 mm
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Signed: Cartier Paris