With the Cyclone derailleurs and sidepull brakes, I am guessing late 1970s, possibly 1980 vintage. Earlier in the era, with centerpull brakes, a bike like this might have had Sunshine high-flange hubs. For yours, consider low-flange hubs with Araya rims. That frame is significantly more refined than my 1971 Nishiki -- the Japanese really learned the art of fine framebuilding through that decade.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069