Omega Constellation from the '70ties

Dear Fellow Members,
Good morning !
I am in touch with a seller since about one month, trying to find out about the watch he wants to sell.
At first, I got the following very poor pics :


When I asked for more information, after some days I received some other mediocre images :



I have an agreement with the seller, providing I can see the movement .. he has to go to a watchmaker to get the back open .. I am waiting !
I am interested, as the watch is from the period that I like and because the price is very low.
However, I did not find an image of a similar watch .. nowhere .. to the point that I am a little bit worry.
Would you give me your feelings ?
Thank you for your attention,

Looks rather smallish, is it a ladys' watch? I'd say it's a ca 1986

edit: it does say 1431 on the back though which gives us this https://www.grayandsons.com/w518207-omega-constellation-285mm-1431.html

It could very well be a Lady watch .. even though my C-shape Constellation is 32by34mm only. This watch I believe is an automatic one .. very similar indeed to the one you referenced .. Thank you !

I saw just now a few of these 1431 watches on C24 and indeed some are Quartz without the quartz indication on the dial .. I am afraid this one must be quartz as well ! I'll confirm when I'll see the movement ..

Bummer then. (unless you don't find quartz shameful, lol)