Rare Swiss 18 carat gold chronograph lever pocket watch Circa 1920

Gold rare chronograph featuring a sphygmometer
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A rare 18 carat gold keyless wind chronograph pocket watch with sphygmometer and pulsometer scale, circa 1920. The watch has a nickel finished lever movement, a compensated balance, and a column wheel chronograph. Its white enamel dial features black Arabic numerals, black outer minute and 1/5 second divisions, and a black-and-red pulsation scale. There are subsidiary dials at 6 and 12 for seconds and 30 minute recording, along with gilt spade hands and a centre chronograph hand. The case is made of 18 carat yellow gold with a smooth back and caseband, and is hallmarked Tête de Cheval, Départements, 1838-1919.
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Diameter: 52 mm
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Weight: 95.2 g
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Signed: No name
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A sphygmomanometer, also called a blood pressure monitor or gauge, measures blood pressure. It uses an inflatable cuff to control blood flow in the artery and a mercury or aneroid manometer to measure the pressure. Manual sphygmomanometers are used with a stethoscope for the auscultatory technique.
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A sphygmomanometer includes an inflatable cuff, a measuring unit such as a mercury manometer or an aneroid gauge, and an inflation mechanism, which can be a manual bulb-and-valve or an electric pump.