Need help to identify my watch

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Hello, I recently acquired the pictured watch but haven't been able to identify the model or the rarity, help please, thank you.
Steve.

 
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No "models" in those days (not many anyway).
Simply an Omega Gents watch dating from approximately 1917, silvered metal dial with "Paris" style Arabic numerals and blued steel "Poire" hands.

If you can measure the diameter across the back of the movement it would help to identify the caliber.