Why is the 6 o clock over Swiss made?

Hello everybody, I have see this vintage omega de ville for sale which I would like to buy. I have read some stories where these watches have their parts switched around with incorrect movements. Is there anyone who verify this for me? This seller has loads of watches and even has a page in Instagram of the watches he sold. Also someone told me it’s unusual for the 6 o clock to be over the Swiss made. Could this be redial?

Thanks