The 1970 240Z was introduced to the American market by Yutaka Katayama, president of Nissan Motors USA operations, widely known as "Mister K". The early cars from 1969 to mid-1971 had some subtle differences compared to late-71 to 1973 cars. The most visible difference is; these early cars had a chrome "240Z" badge on the sail pillar, and two horizontal vents in the rear hatch below the glass molding providing flow through ventilation. In mid-1971, there were production changes, including exterior and interior colors, was restyling of the sail pillar emblems were with just the letter "Z" placed in a circular vented emblem, and the vents were eliminated from the hatch panel of the car, due to complains of exhaust being circulated into the car. Design changes for the US model 240Z occurred throughout production but were not always reflected in the JDM Fairlady if they were specific to federal requirements, including interior modifications for the 1972 model year and a change in the location of the bumper over-riders, as well as the addition of some emission control devices and the adoption of a new style of emissions reducing carburetors for the 1973 model year.