In October 1946 the company exhibited the prototype “Rosengart Super 5” at the Paris Motor Show at the instigation of Lucien Rosengart himself. However, support for the Super 5 from the Societé Industrielle de l'Ouest Parisien (SIOP) itself (which had held the controlling interest in the business since 1936) was less than whole hearted. Soon after this Rosengart disposed of his residual financial interest in the business that still bore his name, and seems progressively to have withdrawn his involvement. After the war Rosengart was not one of the automakers selected for inclusion in the post-war Pons Plan. The Pons Plan reflected government determination to structure the French auto-industry according to priorities identified by politicians and civil servants: exclusion from it created great difficulties in obtaining necessary permissions and materials.
