In 1969 designer Jacques Cooper drew an interpretation of the 914 that he presented to his employer, Brissonneau and Lotz. The French company, a supplier of auto bodies and railcars, approved the project and obtained one of the first 914/6 models built, chassis 1300005, to serve as a basis for the redesigned car. Shortly after this Brissonneau encountered financial difficulties. Cooper, hoping to get the car into production, arranged, with Brissonneau's approval, for the Heuliez company to take on responsibility for development. A running prototype was completed in just two and one half months. The car was displayed at the 1970 Paris Auto Show on the Heuliez stand as the Heuliez Murène. It did not reach production. Heuliez bought the Murène from Brissonneau in 1971 for ₣24,250. In 2012 the car was sold at auction for €42,889 .
