The movement is fairly clean, but no doubt its due a service. The original crystals are hard to find and expensive, so we opt for an alternative solution. We dissolve the glue holding binding the glass to the frame and then glue a generic chamfered crystal in its place. It’s very similar.
The movement also features a nice hacking second mechanism.
Here you can see the cleaned movement ready to be put back together. As always I see that the balance moves freely after fitting the shock jewels. I also fit a new mainspring GR4606.