Swiss stainless steel lever chronograph with register Circa 1925

Stainless steel chronograph with instantaneous 30-minute register by Zenith
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A fine Swiss stainless steel chronograph keyless lever dress watch with 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, micrometre regulator, visible chronograph works. Double sunk 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