Seamaster cosmic back from Omega official service with power reserve issues

panomega · Wed. 4:55am

Good day and apologies for the long post.

I inherited my Dad’s seamaster cosmic caliber 752 (ca. 1969)

Because the watch is a heirloom and has great sentimental value, despite the excessive cost of 1500 euro, I decided to send it to Omega (Switzerland) for service.

Τhe truth is that the watch was my Dad’s daily wearer and it was quite worn.

Despite the issues that had to be fixed, the watch had a power reserve of at least 48 hours.

When I received it from Omega I noticed that the automatic winding system was not working and I had to send it back for fixing it.

The watch went again to Omega Switzerland and when it was returned, while auto winding was working properly, the power reserve was reduced to 36 hours.

I checked power reserve by fully winding the watch manually (70 turns) and letting it rest without being worn until it stopped.
Didi the same check twice, with the same results.

What do you thing is happening?

Is there any chance that they have changed the spring and replaced it with another one not suitable for the caliber?

And one final remark. The watch gains daily about 15 seconds (relatively consistently).

Do you think that this is an acceptable performane for a watch just in from official service?

Thank you for your patience and input.

JimInOz · Wed. 5:16am

P panomega
The watch gains daily about 15 seconds (relatively consistently).

15 seconds per hour? Per day?

Power rserve for a 752 is listed at 50 hours, I would expect close to that (at least 45) on w serviced movement.

Do you have formal documentation from the Omega Service centre that worked on the watch?

panomega · Wed. 5:22am

JimInOz
15 seconds per hour? Per day?

Power rserve for a 752 is listed at 50 hours, I would expect close to that (at least 45) on w serviced movement.

Do you have formal documentation from the Omega Service centre that worked on the watch?

15 seconds per day.
I have the receipt form Omega boutique and one laminated card mentioning various codes one of which is the repair nr.

JimInOz · Wed. 5:31am

My last Omega official service included a full work sheet listing:
All observations on the watch as received,
A full description of the service and
A list of replaced parts.
I also received the actual parts replaced by Omega in a small plastic bag.
If you don't have that I suspect something is NQR.

panomega · Wed. 6:06am

JimInOz
My last Omega official service included a full work sheet listing:
All observations on the watch as received,
A full description of the service and
A list of replaced parts.
I also received the actual parts replaced by Omega in a small plastic bag.
If you don't have that I suspect something is NQR.

If I recall corectly I have received one e-mail from Omega estimating the works that they were planing to perform before starting the actual service so that i would approve the cost.
I have not received list of replaced parts but I received the actual parts which were replaced in a small plastic bag.

ecarpino · Wed. 7:55am

I don’t have the tolerance sheet for this movement but generally on a vintage caliber, +15 seconds a day is within the range Omega accepts, even though it’s not ideal or course..

Regarding the power reserve, it’s very strange and I would recommend to bring it back, but first try to wear it daily for a week or so and test it again, sometimes the greases inside the barrel need time to work, although this is probably not the issue if they kept it for some weeks.

Endshake · Wed. 8:44am

The power Reserve for the 752 is around Max. 50hours for this one. If it is not, they did not do a good Job and you should return it.

sonicosa · Wed. 8:56am

I like Seamaster Cosmics, I bet it's really special to have one that used to be your father's.
Can we see a picture of your watch?

Archer · Wed. 9:01am

JimInOz
Power rserve for a 752 is listed at 50 hours, I would expect close to that (at least 45) on w serviced movement.

Just curious where you see that? All the information I have from Omega is that the power reserve on the 752 (like all the 55X, 56X, and 75X movements) is listed at 38 hours.

I see results in the mid to high 40's after service, but I can't say that I've ever seen one at 50, that I can recall anyway. Of course if someone is using a generic mainspring that is longer than the Omega spring, the power reserve will be longer, so it's possible that it can happen. It could also happen with a stronger spring than Omega uses, as the torque will be higher for longer.

P panomega
15 seconds per day.
I have the receipt form Omega boutique and one laminated card mentioning various codes one of which is the repair nr.

Omega specs require that the average daily rate, measured over 3 positions on a timing machine should fall between 0 and +18 seconds per day. So the timekeeping is within Omega specs if you are getting +15 per day. It wouldn't leave my shop running that fast, but it is within what Omega requires.

I would suggest that you can check of there is a position where the watch runs slower, and you can store it in that position overnight to help slow down the daily gain.

panomega · Wed. 11:10am

Thank you all for your input.
From what I remember, the power reserve of cal. 752 is indeed 50 hours.
This is why I am concerned...
Do you think that 70 turns are adequate winding to give full power reserve?
I am now retesting its power reserve and have given 100 turns (which I believe is too much).

Sending it back to Omega is not easy for me since the Omega boutique is at another town and there is no local authorized dealer.

Since the watch is otherwise operating properly I am thinking of leaving it as it is.
But I am so disappointed from Omega.
Here's a photo of the watch.

Archer · Wed. 11:51am

P panomega
From what I remember, the power reserve of cal. 752 is indeed 50 hours.

It is not. It's officially 38 hours as indicated at the red arrow:

panomega · Wed. 1:14pm

I stand corrected. My reference was mainly based on below sources:

https://www.emmywatch.com/db/movement/omega--752/
And
https://ranfft.org/caliber/8519-Omega-752
And
https://www.buzzufy.com/blog/2016/1...EiJA7PtE9wNqzZzRaavpTsg4Yar3o6tYbg26BJnhUvbd9

I thought these sources as quite reliable.
Reckon that the table you have quoted is from an official Omega source?

Thank you for your replying.
It will be a great relieve to know that there is no problem with the power reserve, though I am pretty sure that before sending the watch to Omega it had 48ish power reserve.
BTW I have never used a non genuine hairspring

Archer · Wed. 1:21pm

P panomega
Reckon that the table you have quoted is from an official Omega source?

Yes. It's directly from Omega.

While Ranfft and these others can be helpful, I have found many errors in the information they provide, so I wouldn't take them as a completely reliable source for such details.

panomega · Wed. 2:12pm

Once again thank you very much for all the information. I feel relieved that at least I don’t have a power reserve problem.

Archer · Wed. 2:26pm

P panomega
Once again thank you very much for all the information. I feel relieved that at least I don’t have a power reserve problem.

Just to be clear, 38 is what is required, and 36 is quite low, so there still may an issue.

Endshake · Wed. 2:45pm

I also looked on ranfft…
I thought ranfft is quite acurate…

Dan S · Wed. 2:56pm

As an aside from the power reserve discussion, I'm curious about what was done to the watch. The hands look new, but the dial looks old and patinated, but with new lume dots. It does not appear that they refinished the case with the proper surface finishes.

What did Omega list as the work performed?

panomega · Wed. 3:54pm

The hands are indeed new. The face was not changed (the discolouration was probably due to humidity ingress) The lume dots were changed on 2018 (previous service again from Omega). In fact two lume dots (5 and 9) were missing when I sent it for service this year but were not replaced. As for the case they mentioned that because it is gold plated they cannot renovate it.

panomega · Wed. 4:03pm

Archer
Just to be clear, 38 is what is required, and 36 is quite low, so there still may an issue.

I understand, but wouldn’t it be normal after 50+ years of constant use and abuse the mainspring to lose some of it’s elasticity and therefore not be able to have it full original power reserve capacity?

Dan S · Wed. 5:17pm

P panomega
I understand, but wouldn’t it be normal after 50+ years of constant use and abuse the mainspring to lose some of it’s elasticity and therefore not be able to have it full original power reserve capacity?

The mainspring would generally be replaced.

Seamaster cosmic back from Omega official service with power reserve issues

panomega

JimInOz

panomega

JimInOz

panomega

ecarpino

Endshake

sonicosa

Archer

panomega

Archer

panomega

Archer

panomega

Archer

Endshake

Dan S

panomega

panomega

Dan S

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