Hey, nice find. I uncovered a sister-bike of this last year in PTA, in metallic grey and with Suntour track parts instead of Campag...I haven't found this exact model from any old catalogues, but as far as I know, there never was a Treviso Pista, so it could be called something else. Treviso was just a place where these were made, and a popular road / racing model they produced, the second behind Montello. Can you see if yours is SL or SLX? I had lost the stickers, but the frame feels lighter than a SL. The track fork is tight, and someone had slightly filed mine some more space...