Please help with identifying this Omega watch

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I need help identify this family piece. I've looked up the serial number and I think its was made around 1915 but I'm not 100% sure and I cant seem to find any others out there that look similar.

 
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We see the caseback, serial number places it around 1915, you are correct. Hallmarks indicate a silver case, I believe, I'll follow through in a bit.
May we please see the movement ?
Story?

Welcome, Charly! Beautiful piece.
 
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I will get a picture up of the movements asap but I dont currently have the watch with me so may take a few days. It belonged to a great aunt who we think must have inherited it from a family member (theres a lot of family silver pieces from her that are hallmarked from the 1890s up to the 1920s). The great aunt received it as a nursing school graduation present in the 1950s and the inner case, covering the moment, was engraved then with her initials. As I mentioned we know for sure it was a graduation present in the 1950s but we're also pretty sure it had already been in the family since the watches construction.
It looks to me like the same style as the old pocket watches but it also has arms on either side for a wrist band.
 
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The watch doesn't actually keep time anymore and as you can probably see the back plate has come completely off but I would also love some advice on repairing the back and maybe getting it running again.
 
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The watch doesn't actually keep time anymore and as you can probably see the back plate has come completely off but I would also love some advice on repairing the back and maybe getting it running again.
An independent watchmaker can repair the movement, and perhaps refer you to a custom jeweler who can repair the case.
 
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It looks to me like the same style as the old pocket watches
Early wrist watches were often converted pocket or brooch watches.
The soldiers of WW1 made wristwatches popular as they needed accurate timing but had to have their hands free.
Your watch may have very well been converted by soldering lugs (wires) to the case to accept a strap. One lug has failed but silversmiths and jeweler/watchmakers can repair. The caseback also can be fixed but I must ask your intentions?
I ask because restoring a working watch may be difficult and it would be very fragile.

Struggling to place the origin of your hallmarks but the 925 is a common silver alloy.

I would go slow and in my mind, the beauty is the object and the story, not the timekeeping. I would like to see it put back together properly but I'd check my phone for the time!

Anxious to hear your thoughts and see more pix!
 
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okay I finally have an update! heres a few more pictures, and in answer to your question about my intentions for the watch I'd ultimately like to get it to a condition where I would be able to wear it as a wrist watch.

 
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Struggling to place the origin of your hallmarks but the 925 is a common silver alloy.
Here you go.

 
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Here you go.

Well done, Jimbo!
JiminOz, is one of the very best authorities, a skilled watchmaker and the most helpful chap with the best heart I have ever met!
I would be able to wear it as a wrist watch.
A silversmith and old-school watchmaker would be your friends.
If successful, you will have a delicate, moisture damage- prone antiquity for special occasions.

If I sound negative, I'm not!
Your movement condition seems damn good.
I wish you all the best!
Edited:
 
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Movement could be a caliber 9'''S which was introduced in 1914 but proved to be unreliable.
If you can measure the dimension shown below it will help to pin it down.

Maybe a caliber 12'''S?

 
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I would be able to wear it as a wrist watch.
I would advise against it.
Even as a family heirloom piece, the cost to restore would outweigh its value by a huge margin.
You would need to find the correct hour hand, have the dial restored and the case repaired even before the movement was serviced.
Servicing the movement may be problematic as well, if any parts require replacement they will be difficult to find or very expensive to fabricate.

As @UncleBuck noted
If successful, you will have a delicate, moisture damage prone antiquity for special occasions.

It can still serve as a nice memento if placed on a suitable stand and displayed appropriately.
 
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ah okay well thank you all for the amazing help! heres a picture of the measurements of the movement as well.
 
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Maybe a caliber 12'''S?
I'm guessing the 15'''NN +S my friend. Bet you a wee dram.
OK Charly, we need that measurement!
 
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Dadgummit! lost again.
Please accept my personal IOU pending my circumnavigating the globe.

Us guys who think they know everything can't stand the ones that really do!

Charly, 27mm is about 12 lignes as Jim guessed.
 
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I'm guessing the 15'''NN +S my friend. Bet you a wee dram.
OK Charly, we need that measurement!
A cal 15'' is about 34.6mm ø, the OPs looks to be about 28mm ø.
13''' is 28.9mm ø.

I'm partial to anything from Jura 😉.
 
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ah okay. sorry for the ignorant question but what exactly does it mean that the movement calibre is 12"or 13"?
 
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''' represents a unit of measurement called a ligne. Some early movements didn't really have names beyond their size.