It's an entry level city/light touring commonly called a condorino style bicycle in Italy. The head badge mentions Treviso, a city in NE Italy, just north of Venice and also the home to Pinarello. The Simplex derailleur would appear to be a replacement for a Gian Robert, based on the shift levers. Gian Robert was an Italian company offering low priced derailleurs. often based on others' designs. The shift levers are an obvious Campagnolo clone. I'd place the bicycle late 1960s to early 1970s.