Harry
All I have been able to find out is this:
This E-type Jaguar was driven by Jochen Rindt, a status symbol of stylish racing. Austrian motorsport journalist Helmut Zwickl once paraphrased the first lines of Goethe?s poem Der Erlk?nig (?Who rides here so late through night and wind ? why, it?s the Jaguar of Jochen Rindt?) in reference to the competitive races Jochen Rindt and his friends used to undertake. The exacting demands of the 1970 Formula One World Drivers? Champion (awarded posthumously) brought to light the car?s technical idiosyncrasies: the powerful engine had performance aplenty. However the car had not been designed as a racing car, and its engine performance was often challenged. With Rindt at the wheel, the brake pads lasted an average of one week. Rindt prosaically alluded to the Jaguar?s weak points by praising his friend and mechanic Josef Borka: ?If it wasn?t for Joschi, I?d have to travel by tram.?
The car is a 1963 3.8. Some better pictures:


He used the car extensively to travel through Europe to various race meetings.