Spring Drive, the unique mechanism made available only by SEIKO technology, ensures quartz accuracy while using the mainspring as its sole power source.
The watch will work continuously for approximately 72 hours (three days) when the mainspring is fully wound. The watch features a power reserve indicator to show the winding state of the mainspring. The sweep seconds hand works in a perfectly smooth movement. This is a self-winding watch equipped with a manual winding mechanism.
When first using the watch, manual winding is more convenient.
This watch is powered by the mainspring. To ensure constant operation of the watch, be sure to wind up the mainspring sufficiently before the power reserve indicator points to “0.”
The watch may stop if the power reserve indicator is showing less than one-sixth, especially it is left under a temperature below 0 °C.