CERTINA wrist watch, 1970's biostar, ESA 9154, ref. 7506 001

1 555.-

08.07.2026

8004, Zurigo

CERTINA wrist watch,
Reference 7506 001,
SPECIAL type with biostar elctronic model,
Born in the 1970's, the biostar electronic,
Movement ESA 9154,
diameter ca 39mm,
case and dial in like New condition,
(additional movement SERVICE on request, approximately 400CHF)

INFO about:
BIORHYTHM CALCULATOR
The theory of biorhythm starts from the fact that since birth, man, more precisely his emotional, physical and intellectual abilities pass through favorable, unfavorable and critical moments.
The best way to notice because there are days when you certainly feel good with no apparent reason or otherwise, when you have a starting point of your hands. The biorhythm concept starts with these experiences.

To calculate, enter the date of birth and today's date (or the date for which you want to see the biorhythm diagram) and then click calculate

Biorhythm curves describe very well the energy levels and the capacity for performance on 3 Primary levels: physical, emotional and intellectual.
The intellectual biorhythm lasts for 33 days and relates to your mental capabilities, creativity, aptitude to solve problems.
This cycle supposedly originates in the brain. It influences our memory, alertness, speed of learning, reasoning ability, accuracy of computation.
-100-0% Much more likely to have difficulty in grasping new ideas and concepts.
0%-100% Considered to be at your most intellectually responsive; you're open to accepting and understanding new ideas, theories and approaches.

The emotional biorhythm last for 28 days (just like the Moon's cycle) and relates to your emotional stability or stress.
This cycle governs the nervous system and also is referred to as the sensitivity rhythm. This cycle influences our emotional states, affecting love/hate, optimism/pessimism, passion/coldness, depression/elation.
-100%-0% When you are feeling most creative, most loving and warm, and you are probably more open in your relationships.
0%-100% More inclined to be withdrawn and less cooperative. You may also be very irritated and negative about those things that occur in your everyday life.

The physical biorhythm lasts for 23 days and is related to your physical energy, strenght, health, stamina.
This cycle effects the physical aspect of the body. It encompasses your energy levels, your resistance, and your overall physical strength and endurance. During the positive half of cycle is when you will feel at your best. This cycles influences physical factors such as eye-hand coordination, strength, endurance, and resistance to disease. During the down half of cycle you are likely to have less energy and less vitality. Be sure to follow this cycle if you require physical endurance for either sports or your work.
-100%-0% Low energy. These are not good days for physical efforts or extreme sports. You will feel a bit tired after physical effort. Don't bet on yourself when you play sports with friends. You might be thinking that everything seems a little further away and things are heavier, but that is due to your energy being quite low.