Swiss 18k gold hunting cased chronograph watch Circa 1915

Gold lever pocket watch with 24- hour dial 
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A very fine Swiss, 18K yellow gold hunting cased, a keyless pocket watch with a chronograph, circa 1915. A massive, polished case, hinged gold cuvette engraved with prize medals. White enamel dial with Breguet numerals, outer minute track and outermost fifths of a second division, sunk inner dial with 24-hours, counters for subsidiary seconds and 30-minutes. Blued stainless steel spade hands. A matte gilt movement, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, micrometric index regulator. Dial, case, cuvette and movement signed.
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Thickness: 13 mm
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Diameter: 50 mm
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Signed: Zenith  Swiss
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The dial and case are patinated and the case is slightly scratched.