It looks 1970s, has some bits that look like a Nishiki. I have a Nishiki Competition with the same hubs, same stem, etc. This one looks like one model up.
Compe stem, Vx RD, Suntour bar cons, no bottle cage braze ons = 1970s. Rear wheel could be a replacement.
Fork does not look like Nishiki. TMar will probably know what it is.