Here's a Basso catalog from '81, which is older than your bike. Back in the '80s the top Basso model was Gap, made from SL tubing, and some chrome on the fork crown and right chain stay. Your bike is more chromed up than the old Basso Gap. Perhaps it's the Gap of it's day.
Drew
http://www.bulgier.net/pics/bike/Cat...-ciclibasso81/