Swiss deck chronometer with 56-hour power reserve Circa 1937

Marine chronometer in mahogany transport box by Ulysse Nardin
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A small and fine Swiss marine chronometer with 56-hour power reserve indication, mahogany transport box and static box, circa 1937.
Mahogany box with brass inlays, screwed on the signature shield and with brass gimbals and bowl. Silvered, signed and numbered dial with radial Roman numerals, auxiliary seconds, power reserve indication up to 56 hours and blued spade hands. Brass movement, 64 mm, frosted and gilt, with solid round movement pillars, spring detent escapement, large Guillaume screw balance and blued balance spring
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Diameter movement: 64 mm
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Dimensions box: 80 x 130 x 75 mm
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Signed: Ulysse Nardin, Locle, Suisse, “Marine Service Hydrographique”