Pretty sure its a Volkswagen Cabriolet proposal based on the 411 platform with design input from Pininfarina .
It could be called EA 158 and dated from 1966?
That's the right car, yes.
Actually I had a different date for it but even using Search by Image myself I haven't been able to find this image again to check it, so you did very well indeed to find it..!
If you could point me to where it is by PM then I can verify the info; many thanks.