Please help identify pocket watch

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Hi,
I just received this pocket watch from my grandmother.
According to her it belonged to my grandfather's great-grandfather, but I have some doubts as it would be much older than it looks, but I don't know much about Omega pocket watches.
I haven't managed to open the watch and I don't want to insist
 
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This looks to be a very nice watch.
It can easily be opened, even with a finger nail. There is a small lip on the caseback at about the 11 o'clock position, you can start to open the caseback there.

Inside is another cover that can be opened with a pen knife. Find any previous marks showing where it was opened and use the blade of the knife in the seam. Don't pry or twist, just ease the blade into the seam.

If you are not confident to do this, find a watchmaker (not a jeweller or a shoe repair stall watchmaker) and get them to open and photograph all of the marking inside the watch and also the movement. Also get a measurement of the diameter of the movement where it meets the case sides (in millimetres).
 
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Thank you!

I will find someone to open it on Friday. Do you know if the Omega store in my city would do it?

From the logo and the "Chronomètre" inscriptions, what would be the time frame of its production?
 
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The style of the pendant on the case implies to me perhaps the mid 1920s.
 
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Wow!
Very nice. The movement and case numbers put the watch at around 1907, give or take a year or two.
The movement looks to my eyes to be a caliber 19''' L (Lépine) grade "Elg. Nickel" Superior Adjusted Quality which was introduced in 1902.
It looks to be in very good condition, a true "rare" watch.
 
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Thanks!

I ordered an extract from the Archives at Omega, I already got the digital version.

Calibre: 19``` LOD Elg. (manual-winding chronometer, sub-second,
inverted bridges)

Production: October 3, 1910