Compared to its predecessor - the IMS57 - this medium sports utility vehicle featured a redesigned engine that lowered vehicle's gross weight by more than 70 kg. The M59 was designed by Grigore Negoita in collaboration with Ghita Holbosan. Nevertheless, the M59 wasn't all milk and honey, as it featured reliability problems on its steering and braking systems. So Aro started working on a new prototype - the M 461 - which hit the Romanian market in 1963. It was the last year of production for the M59 model.