It looks like a ca. 1972 model to me, based on the Sugino Maxy crank and the style of stem shifters. Nishiki's Custom Sport was similar, but with cottered steel cranks. Nishiki's Kokusai / International added the Maxy cranks, a straight gauge CrMo main triangle, and aluminum rims.
The first things I would replace would be the brake pads (KoolStop salmon!!!), brake cable housings, and brake cable inner wires. Unless you really like them (I don't), lose the suicide extensions on the brake handles and install a nice set of rubber hoods. Consider replacing the shifters with SunTour barcons.
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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