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CAL. 7R68 “SPRING DRIVE”
SPRING DRIVE MECHANISM
● Like a traditional mechanical watch, the mainspring drives the watch. What is new
is that it also runs a generator which in turn oscillates a quartz crystal. This regulates
the movement of the hands as accurately as a traditional quartz watch.
● The second hand moves smoothly without steps.
POWER RESERVE INDICATOR
● It shows the extent to which the mainspring is wound.
UP TO 48 HOURS OF CONTINUOUS OPERATION
● When the watch is wound fully, it keeps operating for approximately 48 hours.
Until now, quartz and mechanical watches existed as two distinct entities.
Driven by a mainspring, this watch delivers the accuracy of a traditional quartz watch
thanks to the use of the Spring Drive Mechanism newly developed by SEIKO.
SWEEP-MOVEMENT SECOND HAND