I found in an old magazine from 1965 that Sibona & Basano presented a study for a city-car with 2 seats, small dimensions, good handing, low-price, there are two drawings of the car, and the front-one seems exactly this one! In this magazine there is no name for this project but I think you might be right. May I ask you where you found the Tse-Tse? Are you from Italy?