Swiss deck watch with power reserve indication Circa 1950

Large stainless steel deck watch by Ulysse Nardin
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A heavy, Swiss observation chronometer with 36h power reserve display, circa 1950. Key less gilt bridge movement with going barrel, Guillaume gold screw compensation balance, plain cock with polished steel micrometre regulator, compensation balance with blue steel overcoil hairspring, club foot lever escapement, escape pivots with end stones. An additional mechanism that allows the watch to be used as a master timekeeper is the jewelled detent acting on a slotted wheel mounted on the escape wheel pinion.–
Signed and numbered white enamel dial with subsidiaries for seconds and power reserve, the 24 marked red to indicate when the watch should be wound, Roman numerals, and blue steel hands. Large stainless steel case with electrical contact in the band. Clip on cuvette and bezel. Plain screw on the back with Nardin makers mark. Signed and numbered three tier mahogany deck box with sprung electrical contacts and circuitry under the mahogany cover. Rating certificate from May 1950 indicating the watch has been set to sidereal time.
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Diameter: 63 mm
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Weight: 217 g
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Signed: Ulysse Nardin Chronomètre Locle Swiss