French/Swiss platinum keyless lever dress watch Circa 1925

Platinum watch by Cartier and European Watch & Clock Co. Inc.
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An ultra thin French/Swiss platinum open faced pocket watch, circa 1925. The watch has a nickel-finished 16-ligne movement with 19 jewels and lever escapement. The white enamel dial bears the signature of Cartier. It features Roman radial hours, an outer railway minute track, and blued steel Breguet-style hands. The platinum case has a snap-on case back and a blue enamel crest with wings. The dial is signed Cartier, and the case and movement are signed E.W. & C. Co. France.
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Diameter: 46 mm
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Signed: Cartier / E.W. & C. Co. France
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The case shows wear and surface scuffing throughout. Platinum marks are present but slightly rubbed on the bow and inside. Both the case and inner case back are stamped with Cartier numbers. There is an area of enamel that has been restored in a darker shade. The inner lip of the case has scratches. The dial has undergone restoration, with wear and light surface marks visible throughout. There is oxidation at the outermost perimeter. The hands exhibit wear and oxidation. The movement is operational.
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The European Watch and Clock Co. Inc. was established in the 1920s as a collaboration between Cartier and Edmond Jaeger of the LeCoultre & Cie watch factory. Cartier worked with various watch movement manufacturers, including Vacheron Constantin, Audemars Piguet, and Movado, but many of their top products featured movements from the European Watch & Clock Company, which were manufactured at Jaeger-LeCoultre’s Le Sentier factory in Switzerland. The watch cases were made in Paris, Geneva, London, and New York, with each branch responsible for its production. However, the French branch also exported its watches to other stores. In 1930, Jaeger partnered with Jacques-David LeCoultre to form Jaeger-LeCoultre. In the 1920s, Henri Rodanet, the technical director of the Etablissements Ed. Jaeger, developed the Calibre Duoplan, one of the smallest movements with high accuracy.