French flat Art Nouveau knife edge dress watch Circa 1910

Gold watch with precision lever escapement  
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A very flat Art Nouveau dress watch made by Cartier in Paris, France, circa 1910. The plain open faced case of this numbered original Cartier watch is crafted from 18 carat gold, has a so called knife edge shape and a reeded mid section. The original silvered Art Nouveau dial has a cambered hour register, outer minute divisions and blued steel Breguet hands. The very flat high quality precision movement has a lever escapement. Dial signed.
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Diameter: 45 mm
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Weight: 55.5 g
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Signed: Cartier Paris 
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This particular watch comes from the first owner, and is original and in beautiful condition but has a broken mainspring.
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A comparable watch was sold for more than CHF 10.000 in 1992.