Vintage Omega Redial or Fake? Green Dial ID Help

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I bought this about 10 or 15 years ago from a jeweler in the diamond District in New York. No papers, just fun. I welcome any insight. I don’t know if it’s original or a redial.
 
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Back when redials were the rage. You'll need to get the back off to get more information.
 
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Could be a complete fake, the case looks very unfamiliar...