It’s been a while since I have done something non-Omega related! This chunky Seiko Scuba Diver’s watch belongs to Torsten from Hong Kong, and it’s running 30 minutes per day fast! Looks like it needs a service …
Not very good – huge beat error, and a pretty random pattern.
Even though the dial doesn’t have a window for the day and date, the 7S26 has both. A bit odd – if it’s there, you might as well show it…
The finishes here to remind me of quartz movements, not quite what you expect from a mechanical movement.
The plastic case ring would suit a quartz watch better, too 😉
The auto-winder is the simplest construction possible. In order to save money, you can’t even hand-wind the movement.
I’m not the first one to take this movement apart, as you can see by the various scratches where people tried to remove the circlips for the auto-winder wheel. It’s very easy to remove without even touching the plate, so I wonder what’s been going on there.
The escape and fourth wheel both have cap jewels, but only at the top, and not at the bottom, which makes the whole exercise a bit pointless.
The click for the barrel wheel also isn’t the most expensive construction.
Where it matters, execution is good.
I will fit a new mainspring as usual. I’m using a 0.95 x .12 x 400 x 10.5.
With the balance jewels removed, I’m almost there.
Ready for the cleaning machine.
All parts cleaned and ready for reassembly.
I start off by fitting the cap jewels for the escape and fourth wheel.
Then the new mainspring goes in.
The circlips for the auto-winder wheel is back in place.
And the great train goes back in. On some versions of this movement, Seiko didn’t even cut out the wheels, but this one has 3 spokes on the third and 4 spokes on the fourth wheel.
The wheels are turning freely and are oiled, and I can now put the pallet fork in.
The movement is beating again.
Now this looks a lot better than before! Now all the plastic wheels for the day and date wheel are mounted.
The date wheel is working, and I’m ready for the day wheel.
All in place. Shame nobody will ever see the date and day change 😉
The dial and hands are in great shape. I just wonder why there is no “Seiko” on the dial…
The crown gets a new gasket.
And so does the screw back.
The case back has quite a bit of damage from corrosion.
The movement is cased again, and the watch looks great!