Large Swiss gold open faced keyless lever watch Circa 1920

Gold keyless lever by Ulysse Nardin
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A very fine, slim and large Swiss 18 carat gold open faced keyless lever pocket watch, circa 1920. Frosted gilt movement, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Gold hinged cuvette engraved with the Ulysse Nardin Prix D’Honneur medals. White enamel dial with dauphine numerals, outer minute track, subsidiary seconds and original blued steel spade hands. Case back engine turned. Dial, case, cuvette and movement signed, case numbered.
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Diameter: 52 mm
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Signed: Ulysse Nardin Locle & Genève