If you've got a crank with 3-bolt chainrings, is it a Sugino Maxy? If it is, I have some chainrings that might fit. I'm out of town right now, but when I get home, I'll check to see what I have.
I used to have a 1972 Nishiki Competition, but I sold the frame a couple years back.
Enjoy the International!
Nath Dresser Spring Green, WI