Omega Seamaster DeVille Automatic Turler Opinions Needed

I am trying to sort through some of the watches left to me by my late father. He was an Omega fan too. In his collection I came across this DeVille. White gold I think. I took it to my watchmaker and he could not open the caseback and did not want to force the issue, so it remains unopened.
I know I need the reference number but, in the mean time, please offer opinions on the watch. I can't find any pics with stick hands and this dial. I am not clear on the gold purity. Even with a loupe the touchmark is unclear. Value?

Any guess on the karat? to me it looks like a lady's head on the touchmark.

According to this post here on the forum, it should be 18K.
https://omegaforums.net/threads/gold-mark-dial-omega-166-033.106941/

Agree with the above - looks like a ref. 165.008 and dial looks fine to me. Interestingly, the calibre 711 is the thinnest automatic movement Omega has ever made. It also came in a chronometer version, named 712.