Seiko 9R15 Watch User Manual


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
Here is the step-by-step description of the Spring
Drive in an easy-to-understand manner.
This is how the Spring Drive works.
Mainspring



1
Gear train • hands



2
Tri-synchro regulator









3
For the Spring Drive, the mainspring is wound and the
unwinding power of the mainspring moves the hands in
the same manner as the mechanical watch.
It di󰮏ers from the mechanical watch only in the speed-
regulating unit (mechanism for controlling accuracy).
◎ Temperature change












◎ Di󰮏erence in position
󰮏



󰮏󰮏

󰮏
◎ Impact





◎ Overhaul




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