Swiss gold chronograph with pulsometer scale Circa 1922

Gold doctor’s watch 
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A Swiss 18 carat gold open faced keyless chronograph pocket watch with pulsometer scale made by Vacheron & Constantin in Geneva, circa 1922. This watch features a 1/5 second chronograph activated by a single round pushpiece located on the winding crown. A polished case. White enamel dial with black Roman hours, an outer minute and fifth of a second track with Arabic five minute numerals, an outermost red pulsometer scale graduated to 30 pulsations, subsidiary seconds at 6 o’clock and gold spade hands. The movement with a lever escapement, an index regulator with a swan neck spring and a micrometric screw. Dial, case and movement signed.
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Diameter: 49 mm
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Signed: Vacheron & Constantin Genève Suisse