The S.M.75 was designed by Alessandro Marchetti in the middle 30s to replace the household classic S.73. Of that it retained the all-to-Italian classic mixed construction (wooden wing, steel tube fuselage metallic/fabric-covered) but with some aerodynamical improvements specially a retractable landing gear. Born certainly demode, the Marsupiali (Marsupials) were nevertheless robust, decently fast and efficient. As airliners and later, military transports they rendered more than decent services.
Alluring Ala Littoria’s cutaway.