Swiss silver keyless deck and pocket chronometer Circa 1920

Large silver open faced lever by Ulysse Nardin 
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A fine and rare Swiss, silver keyless deck and pocket chronometer, circa 1920. With Guillaume’s balance and 48-hour power reserve indication. A massive and polished case, hinged back, bezel and silver cuvette. Matte silver dial with painted radial Roman numerals, outer minute track, sunk subsidiary seconds and up-and-down scale. Blued steel spade hands. A frosted gilt movement, 21 jewels, straight-line lever escapement, Guillaume balance, eight adjustments, blued steel Breguet balance spring. Dial, case and movement signed.
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Diameter: 64 mm
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Signed: Ulysse Nardin  Locle & Genève
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The dial is slightly scratched and patinated.