Large Swiss silver deck chronometer with power reserve Circa 1940

Silver lever keyless pocket watch 
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A Swiss, silver keyless deck chronometer with power reserve indication and Guillaume balance, circa 1940. A polished case, hinged silver cuvette. White enamel dial with radial Roman numerals, outer minute track, subsidiary dials for the seconds and 36-hour up-and-down indicator. Blued steel Spade hands. A frosted and gilt movement, 21 jewels (the escape wheel and lever with gold endplates), straight-line lever escapement, Anibal-brass Guillaume balance, blued steel Breguet balance spring, spring-loaded micrometre regulator, pin-set. Dial, case and movement signed.
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Diameter: 64 mm
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Signed: Ulysse Nardin  Locle & Genève