So basically you have a quartz Omega from the mid-80's. Quartz watches are not as widely collected as mechanical watches are, and these modern style Constellations are not highly sought after by collectors as well.
If you like it and want to wear it, make sure the dead battery has been taken out - hopefully if it was still in there it didn't leak. If it did, that may require some serious intervention, up to replacing the movement.
I think the value you found in that other link is optimistic personally...
Cheers, Al
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