French Art Deco pendant with an integrated watch Circa 1915

Diamond and emerald, platinum pendant watch by Cartier
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A French extravagant diamond and emerald Art Deco platinum brooch/pendant with an integrated watch, circa 1915.
Platinum, square case with rounded corners, set with rose-cut diamonds and emerald cabochons, elegant Art Deco design; and a square movable centre with an integrated watch. Signed, silvered dial with Arabic Art Deco numerals and blued Breguet hands. Rhodium-plated bridge movement with Geneva Stripes (fausses côtes) decoration, eight adj., nineteen jewels, and screw compensation balance.
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Dimensions: 30 x 30 mm
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Signed: Cartier