French/Swiss platinum keyless lever pocket watch Circa 1930

Platinum watch by Cartier and European Watch & Clock Co. Inc.
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A French/Swiss platinum open faced keyless pocket watch, circa 1930. The watch has a nickel-finished 16″ ligne movement with 19 jewels, signed by the European Watch & Clock Co., Inc. The silvered dial bears the signature of Cartier. It features Roman radial hours, an outer minute track, and blued steel Breguet-style hands. The platinum case has a snap-on, and the inside case back is numbered and signed Made in France.
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Diameter: 46 mm
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Signed: Cartier and European Watch & Clock Co. Inc.
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The case shows signs of wear, surface scuffing, and scratches consistent with its age. The hallmarks and gold marks on the bow are rubbed. The knife edge displays wear and nicks. The dial exhibits wear and oxidation, particularly noticeable between 11 and 1, as well as surface marks throughout. Additionally, the movement shows some light surface wear.
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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.