i checked my hunch that much of this is filmed at the mercedes test track.
the one with the vertical banked turn!!!!!!
pity they did not film the 914 being taken around that crazy curve.
although there looks to be one bit where they are lower down on it but not on the vert bit. probably mercedes did not give permission for anyone but mercedes test drivers on mercedes business to use that section of track?
you can recognize all the parts being used in the program.
including the getting blown sideways machine.
don't think either VW or porsche had anything quite able to rival this facility back then.
only very slightly off topic.
this film is interesting.
https://www.youtube.com/watch?v=eq-NOhmn3UEnot a 914 but is mid engined and is from stuttgart.
on the test track and on the vertical curve.
the footage inside the cars on the curve is fantastic.
my business partner's father worked for mercedes right around this time in the late 60s through to early 70s. he was employed as a test driver. you got sacked if you did not enter this curve at precisely the calculated speed and failed to hold the speed constant.