Swiss stainless steel open faced lever chronograph Circa 1925

Chronograph with instantaneous 30 minute register by Zenith
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A fine Swiss stainless steel open faced keyless lever dress watch with chronograph and instantaneous 30 minute register, made in the 1920s. Frosted gilt movement, 19 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, micrometer regulator, visible chronograph works. Doublesunk white enamel dial with painted Arabic numerals, outer chronograph and 24 hour divisions, subsidiary seconds and 30 minute register dials and original gold spade hands. Polished case, inner dust cover. Dial, case and movement signed, case numbered.
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Diameter: 50 mm
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Signed: Zenith Le Locle, Swiss