Visited parents today and had a closer look at these. My Mother bought the De Ville in 1964 as an engagement present for my father. He still has box & papers. The watch has a new dial after he went swimming with it in 1980s! Bracelet is all original with Omega clasp. The other one is a mystery. I’ve seen one other with a Seamaster moniker. I’d like to know a bit more.
The De Ville I know about. The other my Dad bought 20 or so years ago somewhere in the Burlington Arcade.
I just saw a watch like that second one on the Omega Vintage site when I brought it up. If you can get the case number I bet you'll find it there.
It’s taken a while but it’s a 3977. Launched in 1957 in Belgium. There’s not much info out there. Hands look original and typical of their time; the dial I’m not so sure with logo at bottom of dial ??