French rare onyx, gold and enamel lever watch Circa 1925

Open faced keyless lever watch by Cartier
–
A fine rare French onyx, gold and enamel open faced keyless lever watch with original box, circa 1925.
Gold and enamel case made from a solid piece of onyx, screwed on bezel with a narrow good border and engraved florets, and with a gold pendant and winding crown. Signed, silvered, engine turned dial with Arabic numerals and blued Breguet hands. Signed, rhodium plated bridge movement with Geneva stripes decoration, 8 adj., 18 jewels and gold screw compensation balance.
–
Diameter: 50 mm
–
Weight: 46 g
–
Signed: Cartier à Paris