To participate in the National Formula (Formula Nacional) the company Artes de Arcos, together with Selex produced a prototype sports car, which was introduced in 1966, first at the Barcelona Motor Show, and then in Paris and Brussels. Two prototypes with an engine capacity of 250 and 850 cm3 were shown at once at the exhibitions. The first prototype with the engine Ducati 250 cm3, known as Guepardo (Cheetah), is kept in the museum Collecio D'automobils Salvador Claret.