French Art Deco fob watch in the shape of a seal Circa 1920

An extremely rare and decorative fob watch by Cartier
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An extremely rare and decorative French diamond-set Art Deco fob watch in the shape of a seal, circa 1920.
Gold case with diamond-set black enamel, gold decor, red enamel disc to the centre, pierced and diamond-set dome and pendant and loop. Black enamel link set with diamonds to the black cord. Signed silvered dial with waved enamel bezel, Arabic numerals and blued arrow hands. Bridge movement, nickel-plated, with screw compensation balance.
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Diameter: 28 x 28 mm
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Signed: Cartier