Service: Longines Ultra-Chron. Calibre 341

P1130377The 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.

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Movement looks to be in lovely condition.

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The dial actually looks pretty great and would be impossible to replicate.

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Here you can see the date disk.

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Setting/winding mechanism.

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I take the base movement apart.

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Hmmm yeah right…

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I remove the mainspring to clean it.

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The Longines calibre 431 all in parts and ready to be put back together.

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I see that the balance moves freely after fitting the shock protection jewels.

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I fit the cleaned and oiled mainspring back into the barrel.

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I fit the setting/winding mechanism.

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Base movement back together and ticking.

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I’m very happy with that!

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Movement ready for dial and hands. I have tightened the cannon pinion clutch that was loose.

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The dial and hands back on the movement.

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Movement back in the case.

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I put together the auto winder mechanism.

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Auto winder mechanism goes back in place.

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The ball bearing was a little slack so I tighten that. I then fit the osculating weight into the movement.

Certainly a unique Ultra-Chron!

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1 Response to Service: Longines Ultra-Chron. Calibre 341

  1. Gary Lee says:

    Hi Mika, beautiful piece and great work as always. If I may ask you a question? What lubricant do you use on the auto winding mechanism?
    Thanks,
    Gary

    Like

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