Two ETA 24xx movments in one day – first the Glycine Compressor, and now Constantine’s Hamilton Fontainebleau!
Two very different watches, but with a very similar movement.
The case opens by turning the ring 1/4 of a turn.
It takes a bit of jiggling to get the movement out of the case back, as the winding stem is split, but doesn’t want to come apart easily.
Having removed the dial, you get a clear view of the bottom plate and the date changer.
You can see quite a bit of oxidization on the barrel. The centre wheel sits on the bottom plate rather than on the top plate.
Top plate with the auto-winder removed.
The balance assembly.
The gear train with the wheel bridge removed.
Yes, that barrel will need some cleaning up and polishing!
I open up the shock spring and remove the balance jewel block from the plate.
I do the same to the top jewel block that sits in the balance cock.
With the jewels removed, the balance sits between the plate and the cock, and is so protected from damage when going into the ultrasonic cleaner.
Once the new mainspring has arrived, I will put the watch back together.