Please help identify this omega deville ladies

Hi forum,
I recently bought a ladies omega deville manual wind up known to be from the 1970s. It comes with the box as well, will be pictured. Will anyone be able to help me identify the model, and if it is a legit model because i cant seem to google this exact model.

The back of the case has an engraving with the word 'Fond acier'. I did not open the caseback tho, dont know how to, dont want to damage it as well.

Any info would be appreciated! Price point/ year/ model/if its real or fake? :/

Sorry if the photos are not good enough, i tried my very best. Thanks heaps!

The reference number and serial number will be on the inside of the caseback. Have a watchmaker open it for you

Omega has built that many different types of lady's De Ville that is pretty easy to loose overview here.

To me it used to be helpful in the past to snoop through the old-omegas archive.

http://www.old-omegas.com/

There are many catalogues listed from that era.

Perhaps helpful to look through.