The JA is for Japanese made machines. They are tanks but can be very cool looking and retro. I have a couple. One looks very similar to yours. Many were "badged" machines. Meaning, the body type was cast the same and then sent out to different customers who put their name on it. So, quite a few of these are the same but different colors and "names" on them. This one was made in the 70's, probably. Enjoy.