One of Anders’ watches, and it’s a pretty rare military Eterna watch with the 520H movement.
You can see the luminous compound in the usual “military” style, e.g. generously and not too carefully.
The timegrapher image shows that a service is in order.
The dial is in pretty good condition, taking the age of the watch into consideration.
Look at the gunk next to the barrel arbor on the plate – that doesn’t look promising…
The barrel bridge has a lot of gunk on the barrel arbor, too.
Under the microscope, you can see the damaged plate where the barrel arbor has ground into the plate.
And the same on the barrel bridge.
I order a set of bushes in the right diameter.
To fit the bush, the hole for the barrel arbor in the plate has to be broached. The biggest problem here is to stay centred, as otherwise, the barrel will not sit correctly in the movement, and touch the plate or bridge.
You can see how the broached hole is properly centred in the plate.
Now I can press in the new bush and carefully rivet it into the plate.
The bush is pushed in, but needs to go up a bit further.
Once it’s sitting correctly, I broach the inner diameter for the barrel arbor. Slowly does it.
The barrel arbor fits nicely.
The new bush is thicker than the plate, so I will have to take off some material.
With a milling bit, I take off what’s too much.
In order not to damage the plate, I will leave a tiny bit of the new bush to stand proud of the plate.
Here you can see by how little the new bush protrudes from the plate.
Now the same has to be done to the bridge.
The new bush fitted.
… broached …
… and ready to be put back together.
Now I hand over to Mitka, who is putting the watch back together.
The gear train and barrel are in, and the bridges are on.
The set lever spring was broken, and we find a new one.
That’s looking pretty good already.
The complete movement.
The shock protection has an interesting construction.
Dial and hands are left original.
The crystal is a stepped crystal, that is screwed in with a ring from the back.
The movement is cased.
A nice dust cover for the back.
And the watch is complete again.After a bit of running in, this is as good as it gets. Proof that the barrel arbor is running very smoothly indeed in its new bushes.
As requested, a photo of the case back!