"Medical" watches - one of my favourite collector's themes.
-Raketa quartz with gilded case/black inscriptions
-Raketa quartz with chrome case/blue inscriptions
-Slava 2428 "KFG" (still mysterious to me )
-"Cronografo medico 1960", made in the '80/90s with Raketa 2609 inside, made as promotional item for ANTRA (anti-ulcer drug)
All these watches have the heart rate scale. Still missing the Chaika quartz.