The Longines Pulsometer Chronograph with a 40mm stainless steel case has a transparent sapphire crystal caseback to view the automatic column wheel movement and comes on a brown alligator strap. Longines has turned back the hands of time with this vintage 1920s model used by doctors to calculate a patient's heart rate quickly and reliably. This handsome Longines Pulsometer Chronograph is designed to measure the pulse rate thanks to the red pulsometric scale on the periphery of the dial. The chronograph hand, coupled with the pulsometric scale, clearly indicate the patient's heart rate on the screen after only 30 pulses. The vintage spirit of the watch is recreated with a white lacquered dial with painted black Arabic numerals and Breguet-type blued steel hands.