Richard sent in his Speedmaster Professional for a service. It has the 1861 movement, which, compared to the 861 (and the 321) has a rhodium plated movement, and I like the finish.
The case back makes the link back to the original Moonwatch, which has the calibre 321 movement. The 1861 has some minor modifications compared to the 321, but it is indeed almost the same movement.
First peek at the movement. Very nice finishes throughout, and the movement is in pristine condition. No scratches, all screw heads undamaged, and I intend to leave it that way 😉
The bottom plate with the hour recorder.
I start taking apart the chronograph.
The wheel train.
Time to take apart the bottom plate.
Time for the cleaning machine.
As usual, I start off with a new mainspring.
In order to put the base movement together, I put the hour recorder bridge on the bottom plate. You can also see that I have already put in the balance jewels.
The base movement is back together, and ticking.
I adjust the movement, and I’m very happy with what I see.
Now that I know the base movement is performing as it should, I can put the chronograph back together.
The top plate is back together, and looking beautiful. It is indeed possible to take apart a movement, and put it back together without leaving any marks or scratches.
Ready for the dial and hands.
Cased and waterproof tested.