This Speedmaster is one you don’t see too often – it’s a Pre-Moonwatch, e.g. the Speedmaster that was made by Omega before NASA used it for the Apollo 11 mission.
The dial isn’t original, as this is a pre-Professional watch, so that must have been retrofitted at one point.
Anders sent it in, together with the right dial, and the right crown.
You got to love these hand-bitten engravings. Well done, Mr. J. Crook 😉
A first peek at the movement, and all looks pretty good.
Performance is a bit patchy, so we’ll need a service. When testing, I also note that the watch stops just when it’s time for the minute recorder to be pushed to the next minute, so something is wrong there.
I take the case apart for cleaning.
Now I take the movement apart. Some deep scratches on the plates, but that doesn’t affect performance.
The bottom plate with the hour recorder.
All the parts are cleaned and ready for reassembly.
I put the pushers back into the case – with new O-rings and a bit of silicone grease. This is the first case version that has pushers that are screwed in. The previous version had pushers that were just pushed into the case.
The new mainspring goes into the barrel.
As usual, I put the base movement together first so I can check it’s working properly.
That looks pretty good. I will leave the beat error at 0.9ms, as it’s collet adjusted, and it will be hard to get that any better.
Now I can put the chronograph back together, and test and adjust it. The problem with the movement stopping when the minute recorder is pushed persists, and I find out it’s the little spring that presses against the minute recorder jumper that is too tight, so I loosen it a bit, and all is well.
The bottom plate.
This is now the right dial, without the “Professional” on it. The hands are also right for the watch, as the central second hand is more arrow shaped as on the later movements.
As the case back is marked by Mr. Crook anyway, Anders decides on a crystal case back, which does give you a nice view of the movement.
Back together in all its glory.