Swiss gold chronograph with tachometer and telemeter Circa 1910

Gold open faced lever pocket watch 
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A fine Swiss, 18k yellow gold keyless pocket watch with chronograph, circa 1910.
A 15-minute recorder, tachometer and telemeter for 1 to 3 minutes base. A solid, bassine, polished case, hinged case back, bezel and cuvette.
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White enamel dial with printed Arabic numerals, inner scale for 24 hours, 1/5th seconds chronograph scale, subsidiary sunk dials for the seconds at 6 and the 15-minute register at 12, outer tachometer and three multicolour telemeter scales. Pink gold spade hands. Straight-line lever escapement, monometallic balance, blued steel Breguet balance spring, index regulator. Chronograph functions by a single button on the winding crown. Dial, case and movement signed.
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Thickness: 15 mm
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Diameter: 50 mm
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Signed: Auricoste/Just  Swiss
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The case has some dents.