French Art Deco lever pendant watch with brooch Circa 1920

Platinum, sapphire and diamond set open faced keyless lever watch by Cartier
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A very fine and rare French platinum, sapphire and diamond set open faced Art Deco keyless lever pendant watch with corresponding platium and diamond set brooch, circa 1920. Nickel finished lever movement, 18 jewels. Silvered engine turned dial with painted black Arabic numerals, outer black minute track and blued steel hands. Bezels and pendant hoop set with scissor cut sapphires, snap on back with enamelled blue crown, diamond set crown, to the detachable diamond set pin of pierced crown motif. Dial and movement signed, case numbered.
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Diameter: 30 mm
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Signed: Cartier Paris