Does anyone recognize this watch? It is my Grandfather's Omega De Ville that he purchased in Hong Kong. He said it was either 1973 or 1963 but I can't remember what he said. I did google searches and I found watches that look very similar except that they say "Seamaster" on them and this one does not.

 

https://omegaforums.net/threads/vintage-omega-posting-guide.383/ Pay particular attention to point #1