There is the CR Bianchi page:
http://www.classicrendezvous.com/
There's a bike there decalled as a "Specialissima":
http://www.classicrendezvous.com/
Also another decalled "Superleggera"
http://www.classicrendezvous.com/
This would seem to be the model names.
Weren't many lesser Bianchi frames not labeled other than the often too numerous "Bianchi" decals on nearly every tube?
Pete Geurds