Swiss silver lever deck watch with power reserve Circa 1915

Silver deck watch with power reserve by Ulysse Nardin
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An unusual Swiss silver open faced keyless lever deck watch with power reserve, circa 1915. Mechanical movement, 17 jewels. Hinged cuvette. White enamel dial with large Roman numerals, blued steel spade hands, two subsidiary dials for power reserve and constant seconds. Plain case, hinged back. Case numbered, cuvette, dial and movement signed.
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Diameter: 64 mm
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Signed: Ulysse Nardin Locle & Genève