I have a Supercorsa as well. One of the last years for 3 hole lugs, 1982:

http://velospace.org/node/39274

As far as the frame in question, there were no chromed lugs when it was stripped before paint (fork crown was chrome plus drive-side chain stay and drop-outs). Another reason to make me originally believe it's not an Equipe. All the ones I've seen have chrome lugs.

I'm curious to see some pics of the blue frames you describe. What's C&V?