Old Omega (?) cocktail watch identification (clearer photos added!)

Hello all,​

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Help is sought identifying this watch! It belonged to my grandmother, who lived from c.1900 until the mid 1980s. I have no idea when she got this watch.​

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It has a serial number but no obvious manufacturer's mark. Three things make me think it may be an Omega. First, It was recently found by my mother in a box in which it had been sitting for at least 40 years, yet the crown works perfectly, it winds up smoothly, and it keeps good time! Secondly, it was…​

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