All I know is that the caseback is for an Omega Genève but I'm not sure if the watch is a redial or not.
Would love to get a second opinion before I purchase this watch.
Try a Google search on 166.041. I don't think that case back belongs to that case. The dial looks to be an original dial but not for that reference. This is a put together frankenwatch IMHO.
Well, the purported model (aka reference) is engraved on the caseback: 166.041. Except the watch in the photos is certainly not a 166.041. A legitimate 166.041 would have a calibre 565 movement.