My new seamaster is loosing less than one second per day. I use an atomic clock to check the accuracy. I was concerned and emailed omega. Omega said the correct tolerances were -6 to +3. I thought master chronometer movements were suppose to be 0 to +5. Any thoughts

 

There are different tolerances for different movements, so what specific movement is in your watch?

BTW none of the tolerances are what you were told...

 

The movement is the 8800. The tolerances that I was told came from Omega.

 

The tolerance for average daily rate for the 8800 series of movements is from 0 to +6 seconds per day.

So what you were told was certainly not correct.

 

I agree with you, but then why did omega give me those numbers?

 

How the hell do you account visually for less than a second per day? Even with an atomic clock the variances on your own processing of the hand movement may account for less than a second...

Anyway, just curious. I would certainly not be concerned with less than a second. I would not even be concerned with a second or 2. Since it is slow rather than fast I am sure they can regulated for you somehow but an automatic movement will always have variances over an atomic clock. always.

Last thing I would consider is what are you calling a day? and could you test on a 2 or 3 day basis? the watch will act differently while on your wrist than sitting on your night stand. The few times I have measured loss (just recently as I was curious about my 32XXX Rolex movement watches based on another thread) I measured on 24 hours, 12 hours on and 12 hours off roughly. If there was a significant loss or gain I would extend the period one more day or two. Only one of my watches had a significant gain of 4 seconds (explorer) All the others where within a second or two.

I enjoyed the process so now I am testing the Omega (AT was spot on prefect after about 6 years with me) and IWC collection.

Anyway. I'd take "less than a second" any day of the week and twice on Sundays.

 

Because the guy you talked to did not know.

 

Likely because a customer service rep had no idea about watches...

 

I am basing my -.18 per day over the last 11 days when I reset all of my watches for daylight savings time. I am not new to this hobby as I have been in this hobby since 1992. My new seamaster 300m is part of a 9 watch roatation is on a wolf watch winder when not in use. I’ve said my piece, discussion over.

 

AGREE

 

If so then why do they claim on their website that 8800 series is METAS certified with criteria of 0/+5 ?

https://www.omegawatches.com/watch-...axial-master-chronometer-42-mm-21032422004001

 

I would email Omega again and ask for more clarification

 

I mean.... ok man. Don't be aggressive or anything. Just trying to help here not questioning you or your expertise. There are many people participating in this forum that lack your wealth of experience and knowledge. Unfortunately for you you can't close the thread so....maybe the discussion is not over quite yet.

 

No idea - why don't you ask them?

 

Ok, I did my homework and according to the METAS requirements (PDF here https://www.metas.ch/metas/en/home/dok/rechtliches/Zertifizierung_Uhren.html) if movement 8800 falls into Ib category (i.e. fitting diameter D is between 20 < D ≤ 26 mm) then indeed the expected average daily precision P is 0 ≤ P ≤ 6.

 

There is also a 2 category where the tolerances for average daily rate are from 0 to +7.

If you do a little more research, you will find that COSC also has similar trends to higher tolerances with smaller movements, that most collectors are unaware of...

 

That was a valuable lesson, thanks a lot! BTW, my new Seamaster is running so far at 0/+2 a day, so not that bad at all