Swiss pink gold watch with split-seconds chronograph Circa 1915

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A very fine Swiss, 18 Carat pink gold, a keyless pocket watch with split-seconds chronograph and instantaneous 30-minute register, circa 1915. A polished case, split-seconds gold push-button on the band at 11 o’clock, co axial button in the crown for start/stop and return-to-zero of the chronograph, button for setting on the band at 1 o’clock, back monogrammed. Hinged gold cuvette.
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White enamel dial with radial Roman indexes, outer minute track, outermost fifths of second chronograph divisions, black painted Arabic five seconds numerals, subsidiary seconds dial and 30-minute register with black numerals. Blued steel spade hands.
A frosted gilt movement, 15 jewels, straight-line lever escapement with antenna compensation, bimetallic split balance, self-compensating Breguet balance spring, micrometre regulator, split-seconds mechanism. Case and movement numbered.

Thickness: 18 mm
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Diameter: 51 mm
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Signed: No Name
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The case is slightly worn, the dial is chipped under the bezel, and not visible when closed.