The power reserve indicator lets you know the winding state of the mainspring.
Before removing the watch from your wrist, observe the power reserve indicator to check if the watch has stored enough power to keep running until the next time you wear it. If necessary, wind the mainspring. (To prevent the watch from stopping, wind the mainspring to store the excess power that will allow the watch to run for extra time.)
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The Power Reserve Indicator |
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The winding state of the mainspring |
Fully wound |
Half wound |
Unwound |
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The number of hours the watch can run |
Approximately 72 hours (3 days) |
Approximately 36 hours (1 day and a half) |
The watch either stops or is running down. |
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When the mainspring is fully wound, the crown can be turned further, or the mainspring may wind without damaging the mainspring itself. The mainspring of the watch employs a slipping attachment structure, a self-winding watch specific mechanism, to prevent the mainspring from over winding.
The orientation of “the power reserve indicator” may slightly vary depending on the model.
Remarks on the self-winding mechanism of the mainspring
The mainspring of the watch becomes fully wound when it is worn for twelve hours for three to five days.
The winding state of the mainspring may vary depending on actual use conditions, such as the number of hours you wear the watch or the extent of your movement while wearing it. It is recommended that you observe the power reserve indicator to check the level of remaining power of your watch.
In a case where you wear the watch for a short period of time each day, observe the power reserve indicator to check the level of the remaining power. If necessary, manually wind the mainspring.