You may have to have it opened, specific details are inside the caseback. I suspect it is a front opener, so take it to a proper watchmaker, or even an Omega shop, to have it opened & get the details. Here are the closest items on the OVD. De Ville Omega 1971 ST 166.0095 De Ville Omega 1969 BA 166.0053
It screams 1970's in design. I can just hear the manager screaming as he runs down each hall at the Manufacturing Building, "Quartz is killing us!! Make them even more cheap and gaudy looking!!"
Hard to tell. Infos on the inside but can’t tell if it’s a front loader or not. I think it’s a gold cap, but not 100% sure. It has aspects of a few different eras but so hard to tell. The markings denoting the tool to open it seems to predate the style. But that doesn’t mean it’s fake.
Doesn't the fact that it requires a tool make it a front loader? I think this is it but need to open to confirm. https://www.omegawatches.com/watch-omega-de-ville-omega-st-166-0095
I think you’re on the ball. The day/date window of the 75X series caliber is a good pointer to tracing the model.
It's OK, after dinner time here and I've had a couple of beers and a glass of wine with dinner so I'm feeling rather magnanimous.