Swiss gold open faced keyless lever pocket watch Circa 1915

Gold lever watch by Ulysse Nardin
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A fine Swiss 18 carat gold open faced keyless lever pocket watch, circa 1915. Frosted gilt movement, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance with blued steel Breguet balance spring, swan-neck micrometre regulator. Gold hinged cuvette engraved Grand Prix Paris. White enamel dial with Roman numerals, outer minute track, subsidiary seconds and original blued steel spade hands. Engine-turned case with polished borders. Dial, case, cuvette and movement signed.
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Diameter: 49 mm
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Signed: Ulysse Nardin Locle