New member here, need help with an Omega OXG watch

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Bought this watch in an auction. Don't know very much about it. Supposedly Naiad? The movement is 15 jewels, OXG stamped on the movement. Lume on the hands, bluish colored seconds hand. is it legit? any more info on this watch? Im a newbie to vintage watches, sorry Thanks
 
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Google omega serial numbers to get an approximate date.