Unusual 18K gold lever deck watch with power reserve Circa 1915

Gold open faced lever deck watch by Ulysse Nardin
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A heavy, Swiss gold observation chronometer with 36h power reserve display, circa 1915.
Nickel finished bridge movement, large Guillaume gold screw compensation balance. White enamel dial with large Roman numerals, blued steel spade hands, and two subsidiary dials indicating 36-hours power reserve and constant seconds. Plain polished 18K gold case, hinged back. Movement signed.
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Diameter: 57 mm
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Weight: 182 g
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Signed: Ulysse Nardin
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This watch is the luxury version of a typical Ulysse Nardin observation watch, usually made of silver. There are only a few examples of this gold version, which weighs almost 200 grams.