French gold Art Deco knife edge pocket watch Circa 1920

Gold open faced lever 
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A French 18 carat yellow gold Art Deco couteau dress watch, circa 1920. A polished case back, engraved in the center, in fine cut with the cypher CJC stamped by a royal crown. The case is made by AB, probably Alexandre Brédillart, Paris. Gilded colour metallic dial, with suspended Breguet numerals, subsidiary seconds at 6 and blued steel Breguet hands. A gilded brass movement, going barrel, straight line lever escapement,  cut bimetallic compensated balance and blued steel flat hairspring, polished steel index regulator.
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Diameter: 46 mm
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Weight: 47 g
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Signed: No Name
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Some scratches on the case and the dial is slightly oxidizid.
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Montre Couteau: Couteau is the term used by Cartier in their manufacturing records to describe this type of watch with knife edge cases, open faced or hunting cased models.