coupés designed and built by Pietro Frua in Turin. The second, much more numerous series debuted in the summer of 1968 and ended in 1976. These are vehicles that were largely (but not exclusively) built at the Carrozzeria Fissore in Savigliano. The first vehicles bodied by Carrozzeria Fissore still used Frua's design; from 1969 there was a new, Fissore-designed body, from which various derivatives were developed. The Frua models High Speed 375 S (Frua) The first model, the High Speed 375 S, was a two-seater coupé with a body designed by Pietro Frua in Turin. Some of the Monteverdi's details continued features of Frua's earlier work, with notable similarities to the Maserati Mistral and the British AC 428. Some sources claim that the similarities go so far that individual components of these cars, such as glass sections and doors, are interchangeable. The Frua-bodied High Speed 375 S was presented at the 43rd IAA in September 1967, in the Auto Becker booth, and received very positive reviews. Zürich daily Blick referred to it as "the most beautiful shape ever seen between the Alps and the English Channel". In addition to the elegant bodywork and solid handling, the car was also lauded for its luxurious and well-finished interior. Regular production commenced in 1967 at the latest, with work shared between Switzerland and Italy. First, the workers in Monteverdi's Binningen workshop fitted the drivetrain and suspension to the chassis. The roadworthy chassis was then delivered to Turin, where Frua installed the body and finished the car. The ready-to-drive vehicle was then returned to Monteverdi to deliver to the buyer. By this means of production, a total of twelve coupés were produced in the first six months of cooperation between Monteverdi and Frua. High Speed 375 L (Frua) Alongside the regular two-seater coupé, Frua developed an extended version designed as a 2+2-seater on behalf of Monteverdi. The sideline and the roof section were both significantly changed. The prototype was shown in public in 1968, but remained at Monteverdi's factory afterwards and never went on sale. High Speed 400 S Coinciding with the 375 S, Monteverdi announced the availability of an even more powerful model with a version of Chrysler's "Magnum" eight-cylinder with twin four-barrel carburettors, which was to provide . The car never materialized and such a model with a Frua body was never produced. The end of the collaboration with Frua In the