Swiss deck watch with power reserve indication Circa 1962

Stainless steel keyless pocket watch
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A large Swiss stainless steel open faced deck chronometer with power reserve indication made by Ulysse Nardin in Le Locle, circa 1962. The gilt brass lever movement is jewelled and features a Guillaume balance. Silvered dial with Roman hour numerals, an outer minute track, power reserve indication at 12 o’clock, subsidiary seconds at 6 and blued spade hands. A plain case with coin edges and a snap on back. Dial signed, case and movement signed and numbered. Comes in its original wooden box with movement number plaque and with a chronometer certificate dated December 1962.
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Diameter: 64 mm
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Signed: Ulysse Nardin Le Locle Swiss
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This rare and unusual break-circuit deck watch was originally designed to service professionals in remote areas. This incredible innovation allowed one to operate with precise and audible time signals often required in survey tasks such as mapping and solar observations.