Originally Posted by gospodin
Unless someone spliced some anachronistic footage into the video, it really is from 1966. Windsurfing has been around since the late '40s, and there were many different styles of sail. BTW, I have a picture of my dad windsurfing in 1964 and the rig looked pretty much like the one in the video.
I don't think the video was made in the 60's. Here is a link to a web site:
The History of Windsurfing
Note that as late as the 1987, the sails were still very triangular and made of dacron.
The sail in the video is made of clear monofilm which was commonly used since the late 80's early 90's.
I would love to see a picture of your dad windsurfing in 1964. Maybe the history books will have to be rewritten.