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I’m not familiar with “*.webp” picture format. But you can always take a screenshot with your phone and post from there.
https://i.postimg.cc/TPFg0BsR/omega-deville.webp
gatorcpa
The Caseback markings are generally specific to the reference. So we need to see reference info inside caseback
If you peruse photos of various different references you will see a variety of Caseback styles. Some have hippocampus etched relatively lightly and others can be raised and more substantial see a few examples.
Seamaster 600 ref 136.011
Seamaster Deville. 166.020
Seamaster 14704-61 18kt
https://omegaforums.net/threads/the-ultimate-seamaster-de-ville-thread.159035/
Lots of information here
Here is information from Omega:
https://www.omegawatches.com/en-us/watch-omega-de-ville-omega-136-0019
More about the cal. 613 movement inside:
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Omega_613
gatorcpa
some background info you may find helpful
https://www.omegawatches.com/chronicle/1967-the-de-ville-is-born
https://omegaforums.net/threads/dif...r-seamaster-de-ville-and-seamaster-600.18306/