Swiss rare chronometer for the Chinese market Circa 1955

Silver open faced pocket watch by Ulysse Nardin
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A rare Swiss observatory chronometer with 36h power reserve indicator for the Chinese market, circa 1955.
Silver, tiered, polished case. Enamel dial with signature: Chronomètre Hirsbrunner & Co. Shanghai, Ulysse Nardin Locle & Genève, radial Roman hours, auxiliary seconds, power reserve indicator and blued spade hands. Bridge movement, rhodium-plated, with Geneva Striping decoration, spring detent escapement and large Guillaume gold screw compensation balance.
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Diameter: 59 mm
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Weight: 184 g
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Signed: Ulysse Nardin Locle & Genève “Chronometre”