That's my best guess: the scalloped chainstay end and the "spoon" seat stay cap are also consistent details with Torpado. Here's one pic of a typical BB shell from a 1976 Italvega Super Speciale (very similar to a Torpado Super Light), but note that it has cable routing above the shell and long Campy 1010 dropouts (it's earlier than your frame).
http://www.wooljersey.com/gallery/v/...een31.jpg.html
the only Torpado pics I can find are later (mid-80s) but still they have similar stay caps and the scallops, as well as those "barrel shaped" cable eyes...though almost always with "T" engravings at several locations.
Therefore, this might be something they contract built (which they are known to have done).