Thin Swiss platinum knife edged lever pocket watch Circa 1920

Platinum thin gentlemen’s watch
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A thin Swiss platinum open faced Cartier’s montre couteau style keyless dress watch, circa 1920. The rhodium plated, extra adjusted lever movement is stamped with the Geneva quality mark. The dial with an engine turned center, black Breguet hour numerals on a silvered chapter ring and original spade hands. The knife edged case with a hinged back.
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Diameter: 46 mm
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Signed: No name
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Couteau is a term used by Cartier to describe the type of ultra thin watches with knife edged cases, open faced or hunting cased models. These watches, with thicknesses of less than 4 mm for the open faced and less than 5 mm for the hunting cased version, are among the thinnest mechanical watches ever produced.