Swiss 18 Carat gold doctors watch with register Circa 1915

Gold  doctors watch
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18 Carat gold Swiss doctors watch with a nickel-finished lever movement and flyback centre seconds chronograph, circa 1915. Plain cock with polished steel indicator. Compensation balance. White enamel dial with Arabic numerals, two subsidiary dials indicating constant seconds and 30-minute registers. Polished steel chronograph work above the plate. Gold hands. Push-button in the pendant to operate the flyback centre seconds chronograph, dial signed. Three gold lids.
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Diameter: 53 mm
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Signed: Longines
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Weight: 99 gr.
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Working: A doctor measures the heartbeat by starting the chronograph and counts till 30 beats and then stop the chronograph; then, he can see the heartbeat on the right side of the dial.

Dents at the band.
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Reference 0010000