Chronometer with power reserve and moon phases Circa 1940

Silver open faced lever chronometer by Zenith
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A rare Swiss silver open faced keyless lever pocket chronometer with 48 hour power reserve and moon phases, circa 1940. Nickel finished chronometer movement, 19 jewels, oversized monometallic balance, glazed dust cover. Guilloché silvered dial, engine turned chapter ring with Arabic numerals, outer calibrated black Arabic five minute divisions, two subsidiary dials for 48 hour power reserve and constant seconds combined with phases of the moon, blued Breguet hands. Engine turned case, back cover with polished central zone, raised polished bezel, coin edged band, hinged back. Case, dial and movement signed, case numbered.
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Diameter: 59 mm
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Signed: Zenith Chronomètre Swiss made