Project: Omega calibre 321.

Omega 321 project
A client has sent me his Omega chronograph featuring an early 321. He got the watch in exchange for cutting some firewood back in 1979.. It has since been lying in a drawer. I would say that was a pretty good deal if you think of today’s values;) He would like to have the watch repaired and of course a new set of hands as they are missing. 

P1110284

The movement is complete and in decent condition.

P1110285

As expected there is quite a bit of dirt!

P1110289

I start taking the movement apart.

P1110294

These parts are getting expensive so I would rather not brake any of those thin springs.

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Here you can see the 321 gear train layout.

P1110302

I take apart the setting/winding mechanism.

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Broken mainspring.

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Movement taken apart and cleaned.

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

P1110383

New mainspring in the barrel.

P1110385

Base movement almost back together.

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I fit the setting/winding mechanism.

P1110391

Movement is running again for the first time in over 40 years!

P1110390

Nothing wrong with the performance!

P1110392

Chronograph layer back together.

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As I could not find original hands I found a pair that matched closely. Then I tightened them to fit the movement.

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I applied new compound to the dial and hands. I also added some patina to the hands so they would fit the ageing of the dial.

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Movement goes back into the case looking great.

Omega free Seamaster 321

I would wear that!;)

I had a little brain twister when testing the watch. The hour recorder would not reset between 5.30-6.30. Not only that, but the hour recorder would stop working completely. (You can see this issue on the first and third photo)… Removing the hands and dial I discovered that the hammer would jam underneath the hour recorder wheel and get stuck. Inspecting the hour recorder wheel I noticed the hammer hart was a tiny bit thinner at the tip than the rest. That happened to the only position where the hammer would jam. To remedy the problem I unscrewed the hammer hart from the hour recorder wheel and cut a dial washer to shape, I fitted the washer between the hammer hart and hour recorder wheel. The extra hight now made the hour recorder reset effortlessly in every position.

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6 Responses to Project: Omega calibre 321.

  1. Gary Lee says:

    Great job and walk through! Awesome to see watches have a new chance and we get to see the amazing workmanship of the past! I never tire of these. Thank you for sharing Mitka.
    I have a question about dials and reluming. How do you remove the old lime and do you do anything once removed to prepare for the new lume?
    Thanks again,
    Gary

    Like

  2. matabog says:

    Nice tip for the heart-shape reset pieces!

    One question, if I may: how did you tighten the hands holes?

    Like

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