Swiss 18K yellow gold Grand Prix pocket watch Circa 1910

Gold keyless lever pocket watch
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A very fine Swiss 18K yellow gold keyless Grand Prix pocket watch, circa 1910. A polished case, the back cover engraved with a monogram and a hinged gold cuvette. White enamel dial with radial Roman numerals, outer minute track, subsidiary seconds dial and blued steel spade hands. A frosted gilt movement, 15 jewels, straight-line lever escapement, cut bimetallic compensation balance with gold temperature adjustment screws, blued steel Breguet balance spring, swan-neck micrometre regulator. Dial, case and movement signed.
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Diameter: 52 mm
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Signed: Ulysse Nardin  Locle
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The case and movement are slightly scratched, and the dial with 
decoration of hairlines.