Ben sent me this rather sorry looking Seiko 6309-729A. The day dial is stuck somewhere between days, there is a lot of dirt on the dial, and it’s running way too fast. Well, that’s what I’m here for!
This looks wavy, and we have a huge beat error. The amplitude isn’t that bad for a Seiko.
The crown gasket has disintegrated, and the black remnants of it are around the pendant tube.
I can already see why the day display isn’t working – see where it says “ring upward”? Yes, that ring is mounted the wrong way around.
Time to take everything apart. The balance cap jewels are completely dry, and have some white opaque dirt on them.
A fair amount of dirt all around.
The old mainspring.
As usual, everything gets cleaned.
The crown with the old and new gasket. You can see how badly worn the old gasket is, the inside diameter is way bigger than on the new one. All that material was wrapped around the pendant tube.
The crown with the old gasket.
The new mainspring has arrived as well.
And I can start putting the movement back together.
That’s a lot more regular, and I will make a final adjustment once the watch has run for a day.
The auto winder ready for assembly.
And the top plate is back together.
Now for the bottom plate …
You can see the little circlips now being mounted the right way around.
I case the movement, and put a new back gasket in.
That looks a lot better!Lovely watch.