Nice classic find! There use to be a website or newsgroup devoted to vintage bikes, but I have long since lost the link. It was "Classic Rendezvous" or something like that. "Rendezvous" was part of the name. If you can find it and post this bike there, I'll bet you find someone who has heard of it. The center pull brakes point to '70's, or maybe very early 80's, but more likely 70's. Nisi rims were not obscure back in the 80's, though they have vanished from the American market. They made some nice ones, though I no longer remember the models.
Edit: Try this forum: http://forums.roadbikereview.com/forumdisplay.php?f=49