Steve sent me this lovely Longines Ultra-Chron. Ultra because the calibre 431 beats at 36,000 bph, so 10 beats every second.
The rotor of the auto winder blocks sometimes, and it needs a service.
The case back gasket is nicely warped, but that gets replaced anyway.
A first look at the movement – all looks well and in good shape.
The dial is also looking good.
Onto the timegrapher to check what the movement is doing.
That doesn’t look great, and it’s high time for a service.
The gear train exposed.
Most high-speed movements have closed barrels, e.g. you replace the whole barrel to change the mainspring. Not cheap, but at least I can get hold of a new one.
A very tidy bottom plate as well.
The new barrel with mainspring.
And I can start the reassembly of the movement.
The basic movement is back together, and ticking.
Not bad for a start!
The clutch wheel of the auto-winder sometimes jams, but a good clean and lubrication sorts out the problem.
Now the auto-winder bridge goes back on.
I turn the movement around, and start reassembly of the bottom plate.
The date change mechanism is super-snappy, and a great construction. Time to case.
Final adjustment on the timegrapher.
Dial down, I adjust ever so slightly fast.
Back into the case, and with a new crystal, it’s a beautiful watch.With a beautiful movement inside!