Jan sent me this watch for an overhaul. It hasn’t been serviced for quite some time, and various people have attempted to fix the day wheel without success – it’s stuck in groundhog-day fashion between the two Mondays 😉
The case has no back and no bezel – but the “TOOL 107” on the back is the key to success! A normal watch crystal remover will do the trick just as well. Entry here is through the crystal.
[Addendum: The best way to remove the crystal is to pull out the split stem/crown, and to blow some compressed air through the pendant tube.]
The crystal does not come off easily, and you have to use a bit of force to prise the case from it – but hands only is sufficient. Don’t use anything else as you will damage the case.
Before taking the movement out, I take the hands off in order to avoid damage.
Now you have to turn the movement about five minutes anti-clockwise, turn around the case and the movement comes out – hey presto!
And here it is in all its beauty – the Omega calibre 752.
As you can see, the case is just one solid block of metal.
I take off the auto-winder assembly.
Only the barrel bridge left on the top plate.
Now I turn the watch around and dismantle the bottom plate.
Last but not least, I take the balance jewels out for cleaning.
For cleaning, I put the balance assembly without jewels back on the plate – this protects the balance and balance spring.
All parts cleaned and ready for reassembly.
The new Omega mainspring.
The spring barrel with the new mainspring.
And the movement is ticking again.
I turn the movement around and start on the bottom plate assembly.
The crown has three positions: pushed in for winding, pulled out to the first stop for settting, and pulled out all the way to advance the date wheel by one day. You can see the little lever that does that just left of the 7.
The auto-winder assembly goes back on.
With the dial and hands back on, I’m ready for casing. The hands aren’t in great shape, but there is nothing I can do about that.
The case is closed in the same way it was opened.
That looks better! The day/date changers work again, and I only notice now that the watch is set to Friday the 13th – but I’m not superstitious. 🙂
Job done. Lovely watch with a great movement.