Swiss 14k rose gold lever chronograph with register Circa 1915

Rose gold open faced chronograph by E. Mathey-Tissot & Co
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A very fine Swiss 14 carat rose gold open faced chronograph keyless lever pocket watch with instantaneous 30-minute register, circa 1915. Nickel movement, 20 jewels, straight-line lever escapement, cut bimetallic compensation balance adjusted to 5 positions, blued steel Breguet balance spring, swan-neck micrometer regulator. Gold hinged cuvette. White enamel dial with Breguet numerals, outer minute and seconds divisions with five-minute/seconds Arabic numerals, subsidiary dials for the seconds and the 30-minute register, original black Breguet hands. Solid, polished case. Dial, case, and movement signed.
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Diameter: 46 mm
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Signed: E. Mathey – Tissot & Co Swiss