Swiss nickel keyless pocket watch with chronograph Circa 1940

Nickel, bronze and pink gold open faced
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A fine and rare Swiss, nickel, bronze and pink gold, a keyless pocket watch with a chronograph, circa 1940. A polished case hinged back engraved M.S.P. Co., Meter [sic] Dept. White enamel dial, black Arabic numerals, outer minute track with a fifth of a second division, subsidiary seconds. Blued steel spade hands. A rhodium-plated movement, 15 jewels, straight-line lever escapement, monometallic balance, flat balance spring, index regulator, adjusted to two positions and temperatures. Dial and movement signed.
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Diameter: 52 mm
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Signed: Ulysse Nardin  Locle & Genève
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The case is slightly worn and the dial is spotted.