I was reading a car related book called the Encylopedia of Sports Cars. Was reading about a car called the Beutler. They were a Swiss coachbuilder. They did some work for Porsche and used some VWs and related parts in creating their vehicles. The book said that they also built a 4 door VW Beetle. This would have been an oval window at the time.

If interested in reading, here is a link I found on the internet about them..

http://www.sportscardigest.com/cars-...6a-by-beutler/