French rock crystal open faced keyless dress watch Circa 1925

Gold Art Deco dress watch
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A French rock crystal, platinum, 18 carat gold, enamel and diamond set Art Deco dress pocket watch made by Cartier in Paris, circa 1925. The monobloc rock crystal case with a white enamel bezel featuring alternating 18 carat yellow gold radial Roman hour numerals and flowerhead half hour markers, one diamond at 12 o’clock, a platinum band set with rose cut diamonds and a triangular platinum bow. Two tone silver, guilloché dial with an outer minute track, inner radial Arabic five minute numerals and yellow gold Breguet hands. A keyless mechanical movement made by the European Watch and Clock Co. Dial and movement signed.
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Diameter: 44 mm
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Signed: Cartier  Paris
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The European Watch and Clock Co. was established in the 1920s as a joint venture between Cartier and Edmund Jaeger of Jaeger-LeCoultre in Le Sentier, Switzerland.