Amplitude is good, but the movement is dry and has dirt.
This watch was bought by BBC when new.
Movement looks to be in great condition.
I take the movement out of the case.
I remove the dial and hands. The hour recorder construction is just like the cal 27.
I start taking the chronograph layer apart.
Down to the base movement of this 1281.
Here you can see the gear train layout.
I now take apart the setting/winding mechanism.
The old mainspring.
I have cleaned the movement. Now testing that the balance moves freely after fitting the shock jewels.
I fit the crown wheel underneath the gear-train bridge.
Gear train coming back in place.
I fit the setting/winding mechanism and hour recorder.
Base movement almost back together.
Movement back together. I find the 1281 almost like a hybrid of cal 27 and 873 with a little more wire spring etc.
Dial and hands back on the movement.
Movement goes back into the ref: 805 case.
Preforming like a new watch.
