The UMM 4x4 design is derived from a prototype created by the French engineering firm called SIMI. SIMI had produced the Cournil, a rugged two seater boxy looking Land Rover type of vehicle made with Hotchkiss-JEEP parts with Ferguson Diesel tractor allwheel driven mechanicals itself was originally designed and built by mechanical engineer Bernard Cournil. A civilian model was called the SIMI Entrepreneur 4X4. The Cournil Entrepreneur's building rights were acquired in the 1970s by the Portuguese company União Metalo-Mecânica, part of the Mocar group and were renamed as UMM.