Swiss gold lever split seconds chronograph Circa 1915

Gold lever with split seconds chronograph and register
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A very fine and thin Swiss 18 Carat gold open faced keyless lever dress watch with split seconds chronograph and register, circa 1915. Rhodium-plated movement, Geneva striping decoration, 19 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, micrometre regulator. Gold hinged cuvette with engraved inscription. White enamel dial with Breguet numerals, outer minute track and fifths of a second divisions, red five second numerals, subsidiary seconds and 60 minute register dials, original black steel poire hands. Solid case, polished, semi concealed hinge, button at 11 for the split seconds, button in the crown for the start/stop function of the chronograph. Case and movement numbered.
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Diameter: 46 mm
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Signed: No name