Uff, this is one of my favorite bikes. Rigi Corta - Corta means short. I'm happy to have this exemplar. I have found it without front derailleur. It took me long period to search about this derailleur. Instead of finding it, I must made it myself. Campagnolo Super Record group with Omas Titanium bottom bracket.
Here is it!!
"Omas Titanium bottom bracket"