but also as economical family cars as well. The mostly alloy engines were very lively, and highly reliable.The OHC arrangement was quite advanced for the time on a small family car as most home-grown cars were still using less efficient pushrod engines. Paired with the low total weight, excellent handling and cornering, both the NSU 1000 and the much higher powered NSU 1200 TT/TTS outperformed many sportscars. The Prinz 1000 lost the "Prinz" part of the name in January 1967, becoming simply the NSU 1000 or 1000 C depending on the equipment. It has DIN, while the 1200 TT has DIN and the most potent TTS version has DIN from only one litre. The 1000 received large oval headlights, while the sportier TT versions have twin round headlights mounted within the same frame. The first 1000 TT has DIN and uses the engine first introduced in the larger NSU Typ 110. The NSU Prinz 1000 TT was built in 14,292 examples between 1965 and 1967, when it was replaced by the bigger engined TT. This, with a 1.2-liter engine, was built until July 1972 for a total of 49,327 examples. The TT can be recognized by its broad black stripe between its headlights. The TTS was built especially for competition, being successful in both hillclimbs and circuit racing. It has a front-mounted oil cooler and was built in 2,402 examples from February 1967 until July 1971. It was briefly referred to as the "Prinz 1000 TTS" when first introduced. There was also a competition model of the TTS available for sale, with . Production of the Typ 67a (NSU 1000) came to a halt in December 1972. In 1965, an even larger model was added, initially called Typ 110, and from 1967 on NSU 1200. It offered more space, so it was a better family car, but was not as sporty as the smaller models. Therefore, the NSU 1200TT used the 1200 cc engine of the 1200 in the smaller body of the NSU 1000. End of production When NSU was acquired by Volkswagen in 1969, it was merged with Auto Union AG. Auto Union had previously been taken over by VW in 1964 and produced mid-sized cars, resurrecting the Audi marque. The name of the new company changed to Audi NSU Auto Union AG. The small, rear-engined NSUs were phased out in 1973, as production capacity was needed for