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Ladies Omega Power reserve

dnhb
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dnhb WRT Addict

dnhb

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A friend has asked me to look at her Omega watch saying that it seems to keep stopping. It runs to time on the bench for 12-13 hours: is this a normal power reserve for this size/type of watch? (it's 2cm+ diameter but no indications of the model are visible - I daren't try opening it as it looks like it needs a proprietary tool to do so)

20240722_173353.jpg

20240722_173330.jpg

Knebo Distinguished Member

Knebo

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Yes, Jaxa tool or the rubber ball. 

Calibre 630 seems plausible. I recently fixed a 625 (similar to 630, but without centre seconds) and the size/design are similar. 

12-13 hours isn't enough, without question. The cal 630 should do 30h and I believe that's pretty much the lowest you'll find. 

 

 

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dnhb WRT Addict

dnhb

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  On 7/22/2024 at 4:49 PM, RichardHarris123 said:

We need the caliber to know the power reserve.  If you're not willing to open it, how can you help her?

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At this stage I think I can best help her by not opening it (I don't want to scratch the back for a start !) & passing on the advice on offer here!

  On 7/22/2024 at 6:14 PM, Nucejoe said:

Jax tool would work just spread a plastic sheet on the case back.

Perhaps cal 630.

Twelve to thirteen hours power reserve is low.

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Thanks, that's helpful.

dnhb WRT Addict

dnhb

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  On 7/22/2024 at 6:14 PM, Nucejoe said:

Jax tool would work just spread a plastic sheet on the case back.

Perhaps cal 630.

Twelve to thirteen hours power reserve is low.

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Thanks, that's helpful.

In parallel with seeking advice - and thanks for all the responses - I've been recording the watch power reserve each time I've wound it and over 5 days that has doubled from ~ 13 hours to 26 hours, presumably as the watch has 'run in', it not having been used for some time. During this monitoring period I was thinking a new mainspring might be required but I think the fact that it now runs for more than a day might makes it once again a practical timepiece for my friend.

mikepilk Distinguished Member

mikepilk

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  On 7/27/2024 at 2:52 PM, dnhb said:

I've been recording the watch power reserve each time I've wound it and over 5 days that has doubled from ~ 13 hours to 26 hours, presumably as the watch has 'run in', it not having been used for some time. 

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Sounds like it needs a service.

  On 7/27/2024 at 2:52 PM, dnhb said:

During this monitoring period I was thinking a new mainspring might be required 

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You don't usually need to change the mainspring.  I'm currently testing a cal 625 I just serviced. The hairspring looked a little 'tired' in the centre coils, but I thought I'd try it.  It's giving a healthy 290° amplitude (240° after 24h) and power reserve of about 40h (spec is 30h). 

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dnhb WRT Addict

dnhb

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  On 7/27/2024 at 4:14 PM, mikepilk said:

Sounds like it needs a service.

You don't usually need to change the mainspring.  I'm currently testing a cal 625 I just serviced. The hairspring looked a little 'tired' in the centre coils, but I thought I'd try it.  It's giving a healthy 290° amplitude (240° after 24h) and power reserve of about 40h (spec is 30h). 

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The fact is I'm at a very early stage in my Watch/Clock tinkering and don't have the confidence to address a relatively high-end marque that isn't mine when it can be 'improved' sufficiently without any risky intervention. The owner now feels that the watch is a practical timepiece for her as I've shown it didn't just 'stop running' randomly & was thus unreliable which had been her impression leading to it being unused for some time & why she asked if I could do anything to help. I will, however, pass on your comment that it could nonetheless do with a service. 

mikepilk Distinguished Member

mikepilk

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  On 7/30/2024 at 9:08 AM, dnhb said:

The fact is I'm at a very early stage in my Watch/Clock tinkering and don't have the confidence to address a relatively high-end marque

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Wise words. So many think it will be easy, and end up damaging nice watches (despite warnings). The Omega 620/625 are nice simple movements, but just their small size makes them fiddly for beginners. Good luck with your tinkering. One day you will have no problem servicing such movements.

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