WS 19: Servicing a SEIKO Chronograph 6138
We turn the movement over again and see that all the parts on the dial side except the day disk are now mounted. Just next to the date 9 you will find that wheel with 5 teeth which moves the date if the crown is turned in one direction, and the day if the crown is turned into the other direction.
Next to the date 26 you find a large round opening giving a free view to the bottom part of the balance wheel shock assembly. This hole allows a watchmaker to check whether the balance shock protection and eventually replace it without removing the chronograph parts on the dial side and without touching the calendar parts either. A very useful and thoughtful opening. The engineers that designed this movement, always had an as easy as possible maintenance in mind.
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