French rock crystal open faced keyless dress watch Circa 1910

Rock crystal pre Art Deco watch
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A French rock crystal, platinum, 18 carat yellow gold, enamel and diamond set Art Deco pocket watch made by Cartier in Paris, circa 1910-1915. 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 movement with lever escapement and eight adjustments. Dial and movement signed, case numbered.
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Diameter: 49 mm
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Signed: Cartier  Paris