Question: When the Eco-Drive watch stops, what should be done to restore it?
Answer: Firstly expose the Eco-Drive watch to light. Eco-Drive watches with quick start feature will start running in about 10 seconds. After confirming this movement, adjust the time.
Question: The second hand jumps in 2-second intervals. Why?
Answer: This means the battery is yet to be charged enough (insufficient charge warning function). After having the battery sufficiently charged, it will be back to the normal operation.
Question: The second hand moves at irregular set of intervals, such as 1- second, 1- second, and 2-second in turn. What does this mean?
(Irregular Two Second Interval Movement)
Answer: In this case, the watch tells you that the time shown is incorrect because the watch has stopped once and started again (time setting warning feature). After recharging and adjusting your watch, it will be back to normal operation.
Question: Sometimes, the second hand has been seen running very quickly, then come back to normal operation. Why?
Answer: This can happen when you take out the Eco-Drive watch with power save function from the drawer or look at the watch which has been under your sleeve. Under those circumstances such as being left in the dark, the watch goes into power saving status and stops its hand in order to save energy. Once the watch is exposed to light, it catches up with the current time by moving the hands very quickly according to the information kept in it.
Question: Can Eco-Drive watches be recharged under fluorescent lamps?
Answer: Yes. As long as the dial gets light in daily life, it rarely stops.
Question: Does recharging time vary with the seasons?
Answer: Yes. It varies according to the illuminance from the source of light. That is, in winter the time required for recharging is longer than summer, because the illuminance of the sun is weaker than that in summer. Especially in winter, watches tend to be kept under sleeves of overcoats or thick jackets, that could cause the shortage of light energy to run watches. We recommend that you expose your Eco-Drive to the sunlight from time to time.
Question: What are the life spans of solar cells and rechargeable cell?
Answer: According to the experimental data, both will last more than 10 years. It is also considered to lose up to around 20 % of their initial performance in 20 years. However, we think that it won't cause trouble for the use of the watch.
Question: It is said there is no need of battery replacement for Eco-Drive watches. Does this mean Eco-Drive watches are completely maintenance free?
Answer: As of the water resistant models, in order to maintain the water resistant quality, we recommend that you replace the gaskets periodically. Gaskets are aging and deteriorating while being used or just being kept in drawers. The gears in watches are also abrading little by little, so periodical maintenance at the qualified watchmakers or authorized service centers is recommended in order to extend the life of your watch.
Question: What does "power save function" mean?

When the solar cells stop generating electricity resulting from the lack of light energy, the watch stops its second hand at the position of 12 o'clock in order to avoid losing energy. There are models which stop both the minute and second hands (power save mode 1). With getting light on the dial, the watch will come back to the normal operation.

If the above condition continues for 3 days, the watch stops the calendar as well as the second and minute hands to minimize the energy loss (power save mode 2). With getting light on the dial, the watch will come back to the normal operation. Please see the instruction manual on this function, as it works in different ways in different models. When you don't use your Eco-Drive watch for a long time, you could stop all the hands and calendar manually (manual power save mode). In this mode, the watch doesn't come back to the normal operation even when the dial gets light.

* In all the power save statuses above, the watch keeps the time inside.

* The functions work differently in different models. For further information, please see your instruction manual.

Battery Life

Question: Why has the battery completely run down soon after the purchase?
Answer: Except for Eco-Drive models, batteries in the new watches are installed before shipments in order to check if the functions are working as properly as being designed. Therefore, please be noted that those batteries can be running down to a certain extent by the time of purchase.

Daily Care

Question: How to clean adhering substances such as dirt, dust or perspiration off the band?

<Metal band> Metal bands easily gather foreign substances such as dust or perspiration. If using the watch without removing those substances, the band could get rusted. In order to enjoy your watch for a longer period of time, we recommend that you wipe off perspiration with soft cloth after daily use. We also recommend to rinse the band with mild detergent and a soft tooth brush from time to time. However, please be sure not letting water touch the watch case or glass if your watch is not water resistant.

<Leather band> Wipe perspiration gently off the band with soft cloth after use. We also recommend that you sometimes clean the reverse side of the band with soft cloth moistened with ethyl alcohol.

Question: The watch got foggy inside the glass. What kind of care is required?
Answer: When such as rain drops adhere the glass surface, the inside can become foggy. This phenomenon is caused by the water outside on the glass, which cools the inner air around the glass, then makes it condensed. When the cloud disappears by a couple of minutes after drying the glass surface, there is no problem. However in the case the watch stays foggy for a longer time, there could be trouble with water sealing. Examination at an authorized service center is strongly recommended.

Water Resistance

Question: Is it possible to wash a water resistant 10 bar watch with tap water?
Answer: Yes. You can wash it with tap water.
Question: What are the differences between WR200 (Water resistant 20 bar), and Diver's 200M (Air diver's 200m) watches?
Answer: Diver's 200M (Air diver's 200m) watches are specifically qualified for diving, while WR200 (Water resistant 20 bar) watches are designed for the people who touch waters very often in their daily lives. So, Diver's200M (Air diver's 200m) watches go through severer water resistant tests before shipment than WR200 (Water resistant 20 bar) watches do.
Question: What interval is recommended to replace gaskets in the watch?
Answer: Gaskets in your watch are deteriorating little by little as they are aging, and the damages to the sealing can cause the water leakage. After replacing battery at an authorized service center, the gaskets are also exchanged in order to maintain water resistant quality. However Eco-Drive watches, with no such occasions, we recommend that you change the gaskets periodically, once in 2 or 3 years. Please consult our authorized service center in your country for further information such as the repair procedure or the cost.


Question: What can I do to indicate date and day of week of a year which is not covered in the calendar of my watch correctly?
Answer: The calendar function of old watches may sometimes be limited (for example, from 1992 to 2004) and not cover recent years. Date and day of the week are not indicated correctly on such watches after the covered years passed.
In that case, you can indicate correct date and day of week on your watch by setting a covered year which has the same calendar as that you actually want to set.
The list below shows alternative years (1992 - 2004) for 2016 - 2099.
Alternative year list (2016 - 2099)
YearAlternative yearAlternative year from March 1

About "Alternative year from March 1"
The years 2016, 2036, 2040, 2044, 2064, 2068, 2072, 2092 and 2096 are leap years. However, their alternative years are not leap years and their calendars will become unmatch with the actual ones after February 29.
In those leap years, you must set another alternative year or "alternative year from March 1" after March 1.
Question: Why does setting an alternative year make date and day of week indication correct?
Answer: The reason why correct date and day of week are indicated by setting a year different from actual one is as follows.
An alternative year of a certain year has the same calendar as that of the latter. In other words, their January 1 is the same day of week.
For example, January 1 of 2017 is Sunday and the calendar of the year can be replaced with that of 1995, which is also start from Sunday.
Question: Why does the perpetual calendar of most watches does not cover years after 2099?
Answer: The year 2000 was a special leap year. A year whose last two digits are divisible by 4 is a leap year and its days become 366 by an extra day being added.
However, there is a supplemental definition for the leap year as follows:
・A year whose last two digits are 00 is NOT a leap year except for the year is divisible by 400.

The year 2000 has 00 as the last two digits but it is divisible by 400 and it is a leap year. Consequently, the years from 1901 to 2099 is a little rare 199-year period when a leap year comes every four years with no exception. (The next period of the same kind is from 2301 to 2499, about 300 years later.)
As a result, it is regarded sufficient for most of computers and other devices to be equipped with the calendar with the simple leap year rule that "A year divisible with 4 is a leap year." and that causes no problems in most cases.
However, the year 2100 is not a leap year as it is divisible by 4 but not by 400 and ends with 00 and the simple rule above will become ineffective and the calendar will become incorrect.


Question: When is a leap second introduced?
Answer: A leap second is introduced in order to adjust the time difference between the uniform time, which is defined by atomic clocks using the frequency of the Cesium atom, and the Earth's actual rotational time. The International Earth Rotation Service (IERS) makes the decision of when to introduce a leap second in UTC (Coordinated Universal Time, the international time standard). Because the Earth's rotational time varies, a leap second is not introduced regularly, but first priority is given to the opportunities at the end of December and June, and the second priority to those at the end of March and September. Please note that when a leap second is introduced, your watch, except radio controlled ones, becomes one second ahead of UTC. (If needed, please make the adjustment.)
Question: Why is IIII used for indicating 4 o'clock instead of IV on the watch dial?
Answer: It is said that the origin goes back to the year 1364 in Paris. When the then French king, Charles V, saw the numeral IV on the clock on the tower in his palace, he disliked the way to express 4 by the roman numeral IV, because it seemed to him like V minus I (5 minus 1). He immediately ordered to change the IV to IIII. Since then using IIII on the dial/face has become the standard among watch makers. This is one of the rarely known episodes in our history.