Note that the crown is on the left, and the pushers on the right.
The movement works, but the second hand of the chronograph gets stuck on the minute hand, and the amplitude isn’t too good, and there is a bit of a beat error. When winding, the watch makes a pretty terrible noise…
Great looking movement – the Buren 11, used by Junghans for their Chronograph and re-named 688.13.
The minute dial of the chronograph has some damage that won’t come off with a brush, but it’s not too bad.
Bottom plate with a simple, but effective date change mechanism.
The centre wheel isn’t in the centre, and you can see it at 1 o’clock of the barrel.
Great movement, with a very technical look. No fancy decorations, but everything well made.
I take photos of every part with its screws as I take it off the plate, which makes reassembly a lot easier.
Almost done with the chronograph plate.
Next layer down – the movement itself. Now you can see that this is an automatic watch, with the famous Buren microrotor.
The wheel train.
There is an odd brass washer above the winding pinion, and I don’t think it should be there. This does not bode well …
And this is the reason for the washer. Some of the teeth of the winding pinion have worn off a bit, and that caused the terrible sound when winding. Doesn’t look like the washer did much good.
As with most chronographs, no lack of parts to clean.
I can’t get hold of a new 1.60 x 0.105 x 380 x 10.5 mainspring, but the old one doesn’t look too bad, so I will reuse it. I start off with braking grease on the barrel wall.
Next, I put the balance jewels back together.
With the barrel on the plate, I start off with the wheel train.
With the balance in and the mainspring half wound, I adjust the beat error and beat rate. Looking good!
Then, the auto-winder and micro rotor go back on.
With the movement layer done, it’s time for the chronograph.
Now that the chronograph is back together, I adjust the depthing of the gears.
Now I will put together the bottom plate.
Dial and hands on, the movement goes back into its case.
Great looking chronometer!