Swiss chronometer with 40h power reserve indicator Circa 1954

Silver open faced deck watch by Ulysse Nardin
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A rare Swiss observatory chronometer “Bulletin 1ère Classe du Bureau officiel de Controlé de la Ville du Locle”, circa 1954.
Silver tiered and polished case. Signed enamel dial with radial Roman hours, auxiliary seconds, 40h power reserve indicator and blued spade hands. Bridge movement, frosted, gilt, with Guillaume gold screw compensation balance.
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Diameter: 64 mm
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Weight: 233 g
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Signed: Ulysse Nardin Locle & Genève “Chronometre”