Help to identify this Omega Constellation

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Hi guys, I found this watch that belong to my grandfather but I couldn't identify 100% yet. I found some very similar models but not an exact match and I would like to know if this is a real omega Constellation or if is just a copy.
The case is small, probably is 32-34mm. It's heavy for his size, but I'm not sure the exact weight.
I found it very similar to the Omega in this auction https://auctionet.com/sv/3115009-ar...18k-quartz-armband-i-18k-guld-totalvikt-ca-72 but the one I have had those stones.

Any idea of what's this can be?

Thank you!

 
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I'm only guessing not a genuine Omega or at least the dial isn't. My reasoning. I seriously doubt that Omega would take a solid gold dial
"OM Swiss Made OM" and paint it black.
Edited:
 
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Interesting. I am leaning towards genuine and rare (which doesn't always mean valuable), perhaps a local production case. I can't see a faker using one of the 1970s push button quartz movements but if you were to remove the back you would learn a lot more. It looks pretty easy to pop off as there is a handy tab. Assuming the case is solid 18K, the bulk of the value will be in the gold, it wont have much or any additional value as a watch.