The original owner of this Longines ultra-chron has sent it in to be repaired. He remembers getting it as a gift when he was 15 back in 1974! He has the choice of a Certina DS and this Longines. He was very into his model aircraft flying and the aviation fuel once leaked into the watch creating a very unique patina on the dial and hands. It’s not keeping time and needs a service.
Movement looks to be in lovely condition.
The dial actually looks pretty great and would be impossible to replicate.
Here you can see the date disk.
I take the base movement apart.
Hmmm yeah right…
I remove the mainspring to clean it.
The Longines calibre 431 all in parts and ready to be put back together.
I see that the balance moves freely after fitting the shock protection jewels.
I fit the cleaned and oiled mainspring back into the barrel.
I fit the setting/winding mechanism.
Base movement back together and ticking.
I’m very happy with that!
Movement ready for dial and hands. I have tightened the cannon pinion clutch that was loose.
The dial and hands back on the movement.
Movement back in the case.
I put together the auto winder mechanism.
Auto winder mechanism goes back in place.
The ball bearing was a little slack so I tighten that. I then fit the osculating weight into the movement.