I've always been fascinated by the technology of these, and knew they were amazing. And of course, very French. Jay's right; had someone taken an interest in marketing these in the US, they may well have taken off in sales. 1967 was the last of them if I remember right; Citroen bought them up and discontinued these marvelous cars.
I liked Jay's fascination with the torsion bar valve springs and the motor mounts on the exhaust headers -- it mirrors my own experience. In the late 1960s, when my college roommate was looking for a used car, we answered an newspaper ad (remember those?) offering a 1959 Panhard Dyna. As an engineering student I was amazed by the motor mounts, and the really impressive performance from the 850cc twin. The valve springs I didn't learn about until Charles Gould showed me the ones on his Dyna just a few years ago. (Charles loves loves loves unusual cars and has two buildings full of them in a western suburb of Boston.) Thanks for airing this video about its successor -- I really like it!