Swiss 18k gold lever with one minute tourbillon Circa 1940

Important gold keyless tourbillon lever by James C. Pellaton
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An exceptionally fine and important Swiss 18 carat gold open faced keyless lever pocket chronometer with one minute tourbillon regulator, circa 1940. Made for Ulysse Nardin. Rhodium plated movement, Le Locle Technicum caliber with curved center bridge, narrow Geneva striping decoration, 19 jewels, three armed equidistant Pellaton carriage with lateral Swiss calibrated lever escapement, cut anibal-brass Guillaume balance with 8 adjustments, blued steel balance spring with Phillips outer terminal curve, index regulator with gold scale plate, the pins with micrometric screwed adjustment. Gold hinged cuvette. White enamel dial with Breguet numerals, outer minute divisions, subsidiary seconds and original blued steel Breguet hands. Solid, polished case. Movement signed by Pellaton, dial, case and movement by Nardin. Accompanied by the original leather fitted box.
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Diameter: 53 mm
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Signed: James C. Pellaton – Chronomètre Ulysse Nardin Locle Suisse
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During the 1920’s and 1930’s James Casar Pellaton was the most esteemed maker of tourbillon carriages, which he supplied to the most prestigious companies, including Patek Philippe and Ulysse Nardin.