Swiss 18 carat gold chronograph lever watch Circa 1900

Open faced pocket watch with chronograph by Ulysse Nardin
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A very fine and rare, large Swiss 18K gold and enamel keyless pocket watch with single button chronograph, progressive register and Guillaume balance, circa 1900. Nickel plated movement, 21 jewels, wolf’s tooth winding, counterpoised and calibrated straight line lever escapement, the escape wheel and lever with gold end-plates, anibal-brass Guillaume balance, blued steel Breguet balance spring, index regulator, steel chronograph work on the backplate, all three operations activated by a single button in the crown.
Polished and engine turned case, the back cover decorated with a red, blue and purple enamel monogram. Hinged gold cuvette.
White enamel dial with radial Roman numerals, outer minute track and concentric fifths of a second track with Arabic 25 second numerals up to 300, subsidiary seconds and 30-minute register. Black steel spade hands. Dial, case and movement signed.
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Diameter: 56 mm
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Signed: Ulysse Nardin
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Accompanied by the original Ulysse Nardin fitted leather covered box and original Paul D. Nardin Certificate.