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Not Omega, But Opinions Welcome

B
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I have couple of Omegas which are fine. I also have a Davosa Ternos.
The Davosa is playing up in that it loses time when the reserve is getting low.
When fully wound up it gains about 6 secs per day, which is fine.
I bought a timegrapher to check it out.
When the reserve is low, even though there is more than five hours remaining it loses time.
At the moment it is losing 49 secs per day.
If fully wound it goes back to plus 6 secs per day…
Also the amplitude drops to 179 when the reserve is low. Is this normal?
The watch is only 18 months old.

Any thoughts?
Edited:
 
kkt
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You need a watchmaker. If you post your approximate location, perhaps a reader can suggest one near you.
 
Dan S
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I'm not familiar with that watch, but why are you interested in running down the watch so far, I assume that the reserve must be about 40 hours. Most hand-winding watches are meant to be wound every 24 hours, and it's really not typical to test timekeeping after that. If it's an auto-winding watch, then it would never run down so far in practice. IMO, it's not surprising that timekeeping will degrade after more than 30 hours. It sounds like you may be borrowing trouble because you purchased a timegrapher.
Edited:
 
B
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Thanks, the watch is only 18 months old
The beat rate is spot on 0.0 to 0.3 depending on the position.
And amplitude is really good when it's fully wound.
It an automatic Selita SW 200 movement.
I have a Tag and two Tissot's, these are both fine.
I'm going to run it until it stops, shake it a few times just to get it going and see where that takes me.
The amplitude is good when there is a good reserve left.
Should the escapement not control the power release better than this?
 
Dan S
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B Bigron100
I'm going to run it until it stops, shake it a few times just to get it going and see where that takes me.
The amplitude is good when there is a good reserve left.
Should the escapement not control the power release better than this?

Truly, I think that you are expecting too much. Isochronism is not perfect in these movements. I don't know the specs of a Sellita SW 200, but I doubt that they extend to timekeeping at the end of the power reserve. If timekeeping is still good after 24 hours, I would be satisfied.
 
felsby
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B Bigron100
...Should the escapement not control the power release better than this?
I am not a watchmaker at all, but the way I see it there is power loss in the escapement, and if the spring does not supply enough power, the beat rate will decrease and the watch will lose time.

What about a new spring? It is cheap.
 
B
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kkt kkt
You need a watchmaker. If you post your approximate location, perhaps a reader can suggest one near you.
I have a watch repairer quite near to me, I've used them before
Prestige Time in Lymn.
Looks I might need to use them again,.
Edited:
 
Canuck
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Eighteen months old? What is the warranty on the watch? Highly unlikely we will be able to aid in a solution.
 
B
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As I am writing this, it has dropped to from 49 sec to 54secs.
I expect it will stop soon.
 
Dan S
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Canuck Canuck
Eighteen months old? What is the warranty on the watch? Highly unlikely we will be able to aid in a solution.

Do you even think there is a problem?
 
B
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Canuck Canuck
Eighteen months old? What is the warranty on the watch? Highly unlikely we will be able to aid in a solution.
I bought of eBay, it from a well respected jewellers though.
 
B
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Dan S Dan S
Do you even think there is a problem?

It looks like there is a problem to me.
You don't think so?
 
Tony C.
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B Bigron100
I bought of eBay, it from a well respected jewellers though.

We'll be the judges of that... 😁
 
Dan S
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B Bigron100
It looks like there is a problem to me.
You don't think so?

Honestly, no. Or at least not based on what I understand from your description so far, which involves timekeeping at the very end of the power reserve. If you provide more information, maybe I will understand why you are concerned. For example, if the power reserve is only 12 hours, that would be a problem. But if the power reserve is 40 hours, and you only see degradation of timekeeping after 35 hours, then I suspect it may just be a characteristic of the movement. I would imagine that even very high quality movements start to run fast or slow as they are about to stall, but it seems irrelevant, and not something I would ever bother to test.
 
B
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felsby felsby
I am not a watchmaker at all, but the way I see it there is power loss in the escapement, and if the spring does not supply enough power, the beat rate will decrease and the watch will lose time.

What about a new spring? It is cheap.

Thanks, not something I could fix. One thing that may be the cause is when I made an adjustment, I touched the balance wheel and it stopped for a second. It seemed to start up again ok though.
I was a few months ago, generally the watch works fine if it's wound up.
I wear it daily but not at night.
 
B
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blufinz52 blufinz52
A Sub homage?
.

I know, I gave my son my Submariner for his 21st.
This is a really nice watch though, just needs a bit of TLC
 
Dan S
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Can you provide a little more detail? If you wear it daily (not at night), is the timekeeping good since it is automatic, or does it slow badly overnight? How are you testing the power reserve? What is the approximate power reserve? etc.
 
B
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Dan S Dan S
Honestly, no. Or at least not based on what I understand from your description so far, which involves timekeeping at the very end of the power reserve. If you provide more information, maybe I will understand why you are concerned. For example, if the power reserve is only 12 hours, that would be a problem. But if the power reserve is 40 hours, and you only see degradation of timekeeping after 35 hours, then I suspect it may just be a characteristic of the movement. I would imagine that even very high quality movements start to run fast or slow as they are about to stall, but it seems irrelevant, and not something I would ever bother to test.

I understand what you mean, but my other automatics don't have this problem.
Certainly not within the last 5 or 6 hours.
 
B
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Dan S Dan S
Can you provide a little more detail? If you wear it daily (not at night), is the timekeeping good since it is automatic, or does it slow badly overnight? How are you testing the power reserve? What is the approximate power reserve? etc.
Dan S Dan S
Can you provide a little more detail? If you wear it daily (not at night), is the timekeeping good since it is automatic, or does it slow badly overnight? How are you testing the power reserve? What is the approximate power reserve? etc.
 
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