Swiss platinum, rock crystal, mother-of-pearl watch Circa 1920

Platinum open faced keyless lever by Cartier
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A fine Swiss platinum, rock crystal and mother-of-pearl open faced keyless watch with movement made by European Watch and Clock Co., circa 1920.  Manual wind nickel finished lever movement, 19 jewels.
Mother-of-pearl two tone dial with Arabic numerals and blued steel hands. Rock crystal case. Case and movement signed bow, dial and movement; movement further signed by European Watch and Clock Co.
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Diameter: 48 mm
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Signed: Cartier-European Watch and Clock Co. Inc. France.