WS 19: Servicing a SEIKO Chronograph 6138

Here you see the levers and wheels of the dial side being assembled. At ca. 10:00 you will see the fine theeth (barely visible in the picture) of the chronograph hour wheel. If you have problems finding it, just look for the thickest axle on the left. That is the arbor of the main spring. At 12:30 you find wheel with interesting teeth, 5 only. That is the wheel which advances the day disk and the wheel underneath it (not visible) advances the date disk. At the top you will also recognize another spring and two long levers.
At the bottom of the picture you can see the bottom (it is actually at the top if you look at the dial, but the names were given by watchmakers that normally look at the watch from the rotor side or dial-down side) part of the balance shock assembly, just look for the golden shamrock shaped spring and jewel.

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