1970s Certina Biostar Varieties

Great post found at "The watchismo times". The article is short, quite sceptic and grumpy however photos are fine.



Maybe the first and the last Biorhythm watch in history.



"Certina made a few varieties of this pseudo-scientific electronic watch all featuring a rainbow of three rings marked with random numbers for love, health and some other nonsense. Oh those silly dirty hippies..."


I see no extra switches to set up day of birth to calculate biorhythms. Most probably the watches were produced and tuned for each customer personally.

Source