Wow! Never expected it would survive.
It's the backview of the Yamaha A550X, the predecessor of the more common Nissan 2000 GT prototype.
These cars were designed by Count Graf von Goertz.
Yes, that's the car, although haven't actually seen it referred to as a Yamaha.
It was a joint venture between Yamaha and Nissan but Yamaha were ditched as their engine was deemed not up to the job.
Hence it is a Nissan 2000GT proposal, which of course heavily influenced the eventual 240Z.
Here's a front view of what is a very attractive car in my opinion:
