Swiss gold deck chronometer with chronograph Circa 1956

Gold keyless wind chronometer pocket watch
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An almost as new deck chronometer with split seconds chronograph and 30 min. counter – an extraordinary presentation watch in a heavy 18k gold case., circa 1956.
We know of no other piece like that. With original box. An 18 carat gold, polished, screw back, gold dome, enamel dial, Arabic numerals, auxiliary seconds, 30 min. counter, blued Breguet hands, 2/3 plate movement, rhodium-plated, “fausses côtes” decoration, finely ground chronograph steel parts, ratchet wheel, ground double hand tong with separate ratchet wheel for split seconds chronograph, Guillaume balance, cam type fine adjusting device.
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Diameter: 65 mm
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Weight: 288 g
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Signed:  Ulysse Nardin   Locle