The 'S' Type was introduced at the same time as the 'R' and made its debut in March 1969. The styling is of a type more to American tastes than traditional British with the fitting of high bars, not a very large petrol tank, ungaitered forks, and a high exhaust system with both pipes on the left hand side of the machine. A shield was a necessary fitment over the pipes for the protection of riders. The exhaust line being a little shorter than that of the Fastback, gave the 'S' Type slightly different power characteristics. Other distinguishing features are a quilted finish to the dual seat and a chromed 'crash bar' around a smaller styled headlamp. The 'S' Type was also the first Commando to have the points driven directly from the end of the camshaft and hence the rev counter drive, which used to be in that position on the twins, moved around towards the front of the engine. The 'S' Type was the basis for the Roadster model which was virtually identical except for a low level exhaust. The INOA Tech Digest states that the 'S' Types fell within the range of Engine Nos. from 131257 to 135088. Some sources cite a factory release suggesting that dealers replace the 'S' Type exhausts with the more commonly found Atlas ones used on the early Commandos.