A beautiful early example. But I do agree "Japanese made is more like it because the production numbers seem to be in the hundreds. prototypes are not made in the hundreds. Let alone sold in quantity. This is the only collector hobby I know where whenever someone "dosen't know" or "isn't sure" the tag "prototype" is added. IMO all that does is spread confusion.
Sorry for the rant. not intended or aimed at the OP. Just my brain leaking again.