The MB.320 was built using experience gained from the company's previous aircraft, the MB.308.

The MB.320 was a low-wing cabin monoplane with retractable tricycle landing gear and powered by two wing-mounted 184 hp (137 kW) Continental E185 engines.

The aircraft flew well, but was expensive to buy with only a small domestic market for the type and only a small number were exported.

Three aircraft were sold to East African Airways for use as feederliners.

Data from Jane's All The World's Aircraft 1953-54 [2]General characteristics Performance