Swiss silver chronometer with electric contact Circa 1880

Extremely rare chronometer
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An extremely rare chronometer with an electric contact device, made by Ulysse Nardin SA in le Locle, Switzerland, circa 1880. The numbered case of this watch was crafted from silver and features an engine turned decoration and an empty cartouche on the back lid and the bezel is inscribed ‘CONTACT‘, next to it a slide and has two contacts for controlling electrical currents every second. The white enamel dial features an outer track with minute division, Roman hour numerals, a subsidiary seconds dial at 6 o’clock and blued steel hands. The numbered movement is fitted with a very fine anker chronometer escapement, Geneva striping decoration and a fine adjusting device.
The case an movement share matching numbers and the case, dial and movement are signed.
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Diameter: 58,5 mm
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Weight: 170 g
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Signed: Ulysse Nardin Locle
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The device for controlling electrical currents every second on the item presented here  is usually only found on some marine chronometers. This device is extremely rare on pocket watches.