Swiss platinum and sapphire set lever dress watch Circa 1920

Platinum open faced keyless lever by Cartier
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A fine Swiss platinum and sapphire set open faced keyless lever dress watch, circa 1920. Nickel finished lever movement, 19 jewels. Silvered guilloché dial with Arabic numerals and blued steel moon style hands. Ultra thin case, sapphire set band, snap on case back with sapphire set letter W. Case and movement signed European Watch and Clock Co. Inc. France, case with handstamped Cartier reference numbers, dial signed by retailer.
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Diameter: 45.5 mm
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Signed: Cartier