At this point, I do not think it is a 1984 Nishiki, Centurion, Fuji, Panasonic, Univega, Sekai, shogun or Miyata. I am not sure about Takara or KHS. I am beginning to suspect that it may be a 1970's bike that was "upgraded" 1984. The lugs and wheels seem older than the drivetrain and brakes.