This watch features“ Spring drive”, the unique mechanism made available only by SEIKO technology.
The Spring Drive watch ensures quartz accuracy while using the mainspring as its sole power source.
The glide-motion seconds hand moves in a perfectly smooth movement.
CAUTION
Spring Drive works by the power provided by the mainspring. Remember to check the power reserve indicator and keep the mainspring of the watch sufficiently wound while using the watch.
Power reserve indicator
Under a low-temperature condition (below 0 °C), the watch may stop if the watch power shown by the power reserve indicator falls below one-fourth (7R series) or one-sixth (5R series, 7R31).
Turn the crown to wind the mainspring.