Certina Red Gold Pulsometer Chronograph 1940sThe Blue Scale Doctor's Watch This stunning red gold cased chronograph features a highly desirable pulsometer scale in blue. Developed for doctors to quickly and accurately measure a patients pulse, the feature has become very popular with collectors of rare chronographsespecially when its a blue printed scale on the dial. The rest of the two register dial is all original and minty. The 36mm red gold case features a snap on back and is in very good