Hi,
I've contacted Fuji a number of times about older Fujis - I have three 67.5cm biggies. They all have "made in Japan" rivited to the head tube. The Fuji reply was that they did not have data on Fujis from the late 1970s to the early 1980s - sorry. If you take a peek at my website, I have some good poop on Ishiwata. You might take a look at your steer tube - yeah, you gotta take it apart, a little - and see if Ishiwata is stamped on the steer tube. If yes, you got a good one!
Jim