Seiko 6R20 Manual - Page 12

English HOW TO READ THE POWER RESERVE INDICATOR • 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 enough power stored 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.) Power Reserve Indicator The winding state of the mainspring The number of hours the watch can run Fully wound Approximately 45 hours 12 1/3 wound Approximately 15 hours Unwound The watch either stops or is running down.