Vintage Omega Watch Identification & Appraisal Help

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Great forum and very informative!

This is my first post here. I do not know much about watches at all. I am trying to get any information on what model or anything else in regard to this watch (see photos). I know it is vintage and has been in storage for many years along with various other things. Beyond that, I have no idea as to what this is exactly or value , besides it having Omega on it. Thank you in advance for any help or input anyone can provide in regard to this watch. Thank you.
 
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Late 1970s early 80s gold plated steel back. Working $100-150 US.

Model information inside back.

Post clear photos of this and movement for more information.