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Co-axial time keeping

J
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So been checking the time keeping on my brand new Railmaster. On the wrist it loses just under a second in 24 hours. Left face up it gains a second in that time. So after two weeks taking it off each night and leaving face up, then putting on in the morning, time keeping has been spot on. That is incredible and better than my COSC Tudor. However given the METAS specification where each watch is certified to within 0 to +5 seconds, I am curious that there are slight positional variations and that it does lose time on the wrist. Clearly would be ridiculous to complain but am a little surprised and wonder if this is a common experience. Overall a stunning watch and the accuracy is stellar.
Jeremy
 
Archer
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The 0 to +5 is the acceptable average rate. If the average rate can be zero, then the rate in any one position can be less than zero. The Delta (difference between the fastest and slowest positions) can be up to 12 seconds and still fall within the METAS specs.

People often view the "0-5" as some sort of hard limit on daily gains or losses, but that's not true at all.
 
josiahg52
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I recommend you go to Omega's website and see what METAS actually means as far as time keeping. As Archer says, it's not just a hard, singular time keeping requirement.

Some threads where co-axials were discussed.

https://omegaforums.net/posts/2216708/ josiahg52
josiahg52 ·
Considering my results further, I must represent an "average" fairly decently.

My observed accuracy - I use an app called WatchCheck which relys on your eyes, reaction time, and your cellular or GPS time - to get a general sense of accuracy. I figure the inaccuracies of this method probably average out or are minimized the longer I observe my watch.

In the second test - AVERAGE DAILY CHRONOMETRIC PRECISION OF THE WATCH - my watch displayed a result of +3.4 sec/day which is nearly what I observe as an average: +2.988 sec/day. Pretty cool. So this test appears to me represent most normal...

https://omegaforums.net/posts/2342165/ josiahg52
josiahg52 ·
First, the Master Chronometer isn't a singular specification. It doesn't really compare straight across to a random timegrapher result. That said, I think your watch is running fine. Since March 10, 2024, my cal. 8800 in a green Seamaster is running within +2 seconds per day and I wear it pretty much all the time.

https://omegaforums.net/threads/omega-8800-caliber-accuracy.162280/

And that Aqua Terra is absolutely stunning.

https://omegaforums.net/threads/new-omega-seamaster-300m-metas-results.172547/ Cover Image
Thread 'New Omega Seamaster 300M METAS Results' ·
Hey guys,

Excuse my new guy question (it’s my first ever Omega watch), but how can I confirm that the attached METAS results are good? Isn’t the 14 seconds a day in the 6 positions test a little...
Din.p ·

My green Seamaster averaged -0.4 spd from 10 March 2024 to 12 November 2024 with a delta of 19.2 spd. It was the last period where it was on a winder that dropped the average and increased the delta. When I wear it normally, it's closer to +0.2 spd on average.
 
J
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Many thanks for your help - had a look at threads as well and very useful.
 
DaveK
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J Jeremy1415
So been checking the time keeping on my brand new Railmaster. On the wrist it loses just under a second in 24 hours. Left face up it gains a second in that time. So after two weeks taking it off each night and leaving face up, then putting on in the morning, time keeping has been spot on. That is incredible and better than my COSC Tudor. However given the METAS specification where each watch is certified to within 0 to +5 seconds, I am curious that there are slight positional variations and that it does lose time on the wrist. Clearly would be ridiculous to complain but am a little surprised and wonder if this is a common experience. Overall a stunning watch and the accuracy is stellar.
Jeremy
How are you checking the timing?
 
J
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10
I use Time is on my phone which is supposed to show time linked to atomic clock. Then check roughly every 12 hours. Time is seems accurate as it shows consistent loss or gains on my watches.
 
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