I think they only came with the wrap around logo on the seat tube. Someone may have added one on the down tube.

According to the brochure, its 531 double butted main tubes and Ishiwata 0265 high-tensile fork and stays. Thats for the 610 which I believe is the designation for the frameset only - used on all the 600 series complete bikes that year.

I think they were brazed in Wisconsin, but a few years later they started having the rear triangle built in Japan except for 700 series and above.