Slim French platinum watch with sapphire rim Circa 1920

Platinum open faced lady’s watch
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A lady’s slim platinum and sapphire open faced watch, circa 1920. Manual winding nickel lever movement, 19 jewels, bimetallic compensation balance, silvered guilloché dial, painted black Roman numerals, outer minute track, blued steel Breguet hands, ultra slim platinum case, sapphire-set band, monogrammed snap on back, case and movement signed by maker, dial signed by Cartier.
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Diameter: 45 mm
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Signed: Cartier/European Watch and Clock, Co.  Paris