the short version is: yours is not a Cinelli Super Corsa. it seems to be a Centurion Equipe designed/built(?) by Cinelli.

the quick giveaway that it is not a SC being the seat lug arrangement.

Cinelli Super Corsa:


Cinelli Super Corsa road frame 1985 (Columbus SLX) by pipco82, on Flickr


Centurion Equipe:


Centurionelli Ofmega build 003 by mtypinski, on Flickr

assuming the frame you were comparing the weight to was in fact a Cinelli Super Corsa, i doubt there would be much difference in weight, especially yours being the "much lighter" frame of the two.

edit: i misread the part about the weight, thought you had it the other way around

i've seen a few different versions of the Centurion Equipe, mainly different fork crowns and most with FD braze on tabs.