Ulysse Nardin. An unusual silver openface keyless lever deck chronometer with Guillaume balance, up and down indicator, break circuit, original Bulletin de Marche, cables and wooden boxes

SIGNED ULYSSE NARDIN, LOCLE, SUISSE, CHRONOMETRE, MOVEMENT NO. 122890, CASE NO. 647775, CIRCA 1950

Details

Ulysse Nardin. An unusual silver openface keyless lever deck chronometer with Guillaume balance, up and down indicator, break circuit, original Bulletin de Marche, cables and wooden boxes
Signed Ulysse Nardin, Locle, Suisse, Chronometre, movement no. 122890, case no. 647775, circa 1950
Cal. 24''' gilt-finished fully jewelled lever movement, Guillaume balance with gold poising screws, cam wheel regulator, the escape wheel pinion fitted with a cam for contact-breaking each second, silver cuvette, the white enamel dial with large Roman numerals, blued steel spade hands, two subsidiary dials indicating 36 hours power reserve and constant seconds, in large circular case with hinged back, a sliding lever to activate the circuit-breaking and transmitting pin in the band, large ball-form crown, in three-tier lacquered mahogany box numbered 122890 with integrated power supply and conductors, outer wooden box numbered 122890 with lock and leather strap, case, cuvette, dial and movement signed and numbered
64 mm. diam.

Lot Essay

Accompanied by Ulysse Nardin original Bulletin de Marche dated July 1950 confirming the adjustment of the movement to sidereal time.

"Break-Circuit" deck watches were designed to assist in surveying and mapping operations as well as solar observations and scientific experiments in remote areas requiring precise and audible time signals. These deck watches, also called survey chronometers, were highly finished and adjusted in order to meet the surveyor's and scientific's requests.

The first break-circuit mechanism was installed in 1874 by S. & J.D. Negus, Chronometer and Nautical Instruments Makers in New York.

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