Here I am!!
I think it is going to be around the early to mid 60's judging from the looks of it.
I will be honest with you the Japanese machine research is in its infancy and we are learning a lot about them but it will be a few years before we can be able to date it like the Kenmores, Singers and others.
I am really involved with the research and I have found out a lot of things about the Japanese manufacturers but I will say this every time I find out some fact that can help it raises 10 more questions and opens up a whole new avenue to the research.
Billy