OK, thanks. I'll change the heading.
But I'm not convinced 1957 is correct either; twin-headlights on a European car in 1957? Hmmm..
I'm sure 1964 isn't right, as the new 911 was already out and seen by then, so it must be a much earlier proposal. Possibly it's been lost in translation; maybe they meant to say it was an early proposal for what eventually turned out to be the 1964 911..?