Omega Cosmic 2000 70’s

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You said yourself: Cosmic 2000. That's the model.
 
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Possibly a 166.130.

Have you used google to try and find a similar watch with the reference stated?
 
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Second that, it's a ref. 166.130 (Date), Day-date is 166.131 and bracelet is 1171/677 and/or 1175/677.

Cheers,

Winny
 
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very cool model with that 70's vibe! from what I recall the center section of the watch pushes out and separates from the outer case shell?
 
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The bracelet in your pics looks like a 1162 with filed 172 or 173 end links.

kind regards Max
 
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very cool model with that 70's vibe! from what I recall the center section of the watch pushes out and separates from the outer case shell?

That's right, and the inner case looks like this one here (pictured from my 166.135).

To open that case one need to pull out the crown and put some compressed air in to get the caseback blown out. Strange method to increase WR that days 😀