Omega Seamaster 2531.80 with 1109 Movement: Service?

WatchIdiot · Jun 28, 2026

Okay my 2531 with the original 1109 movement dtops once every 2 weeks, basically it will be several hours off. Yes I know the automatic winder in it has issues hence why they moved away from them. But I like the fact that its the original movement to the model. Yes I know its not as good, but I am strange.

Is there anything anyone has ever found beyond manually winding it daily or does it need a service. It is about 15 seconds a slow, but that does not bother me. Would a service maybe help it?

Vinz Clortho · Jun 28, 2026

Best thing to do is take it to a watchmaker and have them service it. They will clean and lubricate it, then regulate it to have it running to specs again.

ErichKeane · Jun 28, 2026

This is definitely a situation where it sounds like you need a service. Service would be a tear down and clean, but this could be 20+ years without a service (unless you know better about the history), so a visit to a watchmaker is way past due.

WatchIdiot · Jun 28, 2026

Yeah it may need a service, but from what I read the 1109 movement is a cause of this. The automatic works were not great. It seems fine if I just wind it every day, and that's what I have read.

Just did not know if anyone had an extra insights.

Archer · Jun 29, 2026

I've serviced a lot of these and if done properly, the automatic winding will work just fine. It's basically an ETA 2892A2, which is a very reliable movement. Of course nothing lasts forever so it will need service every once in a while, just like any other watch does.

WatchIdiot · Jun 29, 2026

Archer
I've serviced a lot of these and if done properly, the automatic winding will work just fine. It's basically an ETA 2892A2, which is a very reliable movement. Of course nothing lasts forever so it will need service every once in a while, just like any other watch does.

well I guess I need to break down and do it.

ErichPryde · Jun 29, 2026

WatchIdiot
Okay my 2531 with the original 1109 movement dtops once every 2 weeks, basically it will be several hours off. Yes I know the automatic winder in it has issues hence why they moved away from them. But I like the fact that its the original movement to the model. Yes I know its not as good, but I am strange.

Is there anything anyone has ever found beyond manually winding it daily or does it need a service. It is about 15 seconds a slow, but that does not bother me. Would a service maybe help it?

Is this one of the three liner autos? Cool.

padders · Jun 30, 2026

The 1109 was chronometer rated like the 1120. AFAIK the 3 liners used the 1108 and were not certified hence the missing text. They are not common.

ErichPryde · Jun 30, 2026

padders
The 1109 was chronometer rated like the 1120. AFAIK the 3 liners used the 1108 and were not certified hence the missing text. They are not common.

Thank you, I couldn't remember which number was the three liner automatic, but I knew there weren't very many.

padders · Jun 30, 2026

Or maybe it was a non rated 1109 in the 3 liner, I’ll take a look, I’m not sure but the chrono rated version was much more common.

WatchIdiot · Jun 30, 2026

You are all talking way above my head right now.

ErichPryde · Jun 30, 2026

WatchIdiot
You are all talking way above my head right now.

Does your dial have the "CHRONOMETER" text on it?

WatchIdiot · Jun 30, 2026

ErichPryde
Does your dial have the "CHRONOMETER" text on it?

Yes it does.

ErichPryde · Jun 30, 2026

WatchIdiot
Yes it does.

So, there were some really early 2531s that were automatic but didn't have the CHRONOMETER text. That's all we're chattering about, I misremembered which movement was in those.

WatchIdiot · Jun 30, 2026

I have posted pics before but the watch is below. It's an eBay purchase that got kicked out of the authenticator for being the wrong movement. But the authenticator did not look deep enough to see it was the 1109 movement and that's what came with the early ones. I am actually very happy it's an early one just because.

Omega Seamaster 2531.80 with 1109 Movement: Service?

WatchIdiot

Vinz Clortho

ErichKeane

WatchIdiot

Archer

WatchIdiot

ErichPryde

padders

ErichPryde

padders

WatchIdiot

ErichPryde

WatchIdiot

ErichPryde

WatchIdiot

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