by 1965 had sold nearly 78,000 units. Additionally, it laid the framework which was followed by the entirety of the successive series of Porsche's sports cars. Ferdinand Porsche's fate During his 20 months of jail time in Dijon, Ferdinand Porsche Sr collaborated on designs for Renault and their later popular 4CV. It is speculated that the conditions of his imprisonment contributed to his health decline, and later, his death. In 1947, the junior Ferdinand Porsche gathered the amount of the stipulated bail, immediately after receiving the early fees for his new designs. His father was then released on 1 August 1947, along with Anton Piëch. Once in Austria, the senior F. Porsche reviewed the designs of his son for both projects; the 360 Cisitalia and the 356. He consented with the plans and aided the projects which were in progress. He commented daily to their employees that he "would have done the same designs as Ferry". The senior Ferdinand Porsche was rather sick. Noting this, sentimentally, Ferry took him to revisit Wolfsburg's plant which was flourishing with the massive production of the Volkswagen Beetle—which was carried out under supervision of the British occupation. In November 1950, senior Ferdinand Porsche suffered a stroke which disabled him until his death, on 30 January 1951, aged 75. Return to Stuttgart In the spring of 1949, the general manager of Volkswagen, Heinz Nordhoff, approached junior Ferdinand Porsche and unpacked a massive contract. For Porsche'''s designing services—for example, improving the Beetle--, it specified that Volkswagen would start providing in exchange: a share of the profits from each Beetle sold the raw materials for building the sport Porsches vehicles the usage of Volkswagens world structure of retailers the usage of Volkswagens world structure for technical service Also by this agreement, junior Ferdinand Porsche would become the only dealer of Volkswagen for all Austria. In view of this new stabilized situation, junior Ferdinand Porsche decided to reestablish the headquarters of the Porsche at Stuttgart-Zuffenhausen. Though, the old original Porsches facilities were occupied by American forces. Nonetheless, he rented some workshops then from the company Reutter (which was a constructor of bodies for automobiles). He brought most of his employees and opened on September 1949. Their first work was the development of an engine which was called Carrera. In 1950, the production of the Porsche 356 resumed. Eventually, it was so successful that, despite being originally planned an