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Looks like a ladies jewellery watch from about 1950s era, possibly in solid gold with "bark" finish.
Can't see any hallmarks so hard to tell what it's made of. Do you know what country it was purchased in?
More reading here.
https://omegaforums.net/threads/how-do-i-identify-my-vintage-omega-watch.93146/
Thanks.. I'll give that a read. Bought it in Las Vegas in the early days or canada ( home ). She said it was solid gold.