Nuovo Gran Sport was introduced for the 1975 model year and the front derailleur cage does niot have CPSC lip. so we should be looking at a realtively narrow timeframe of circa 1975-1977, provided these components are OEM. Regardless, the year is easily determined from the open format serial number, which should be on the upper seat tube. The two leading numbers are the year, followed by a letter, which appears to be a fortnight indicator.

It may well be lower mid-range. However, based on the lack of chrome, stamped dropouts and top tube cable stops, I wouldn't rule out the possibility of an upper, entry level model with a lightweight hi-tensile steel. Around this era, Rizzato had their proprietary Tullio tubing. Barring an actual tubing decal, the seat post diameter is the best indicator of tubing grade.