On the other side of the ocean, the Zeffiretto Sport 48S was named the M50S. The taillight became american: bigger en the two toolboxes dissapeared. This model lived to see only one year: 1966. It was replaced by a 65cc model (M65S), like the M-50. The appearance was the same, just a bigger cylinder content! And ofcourse, with an adjusted american look goes higher bars. This model continued till 1970. In 1970 a model with a battery and a ignition lock was manufactured. The battery was fabricated on an open carrier on the right side and the ignition lock on the left. Also foot gear instead hand gear was installed. This model was given the name "Leggero". The production of this model continued till 1971.

Source: Aermacchi-De Gevleugelde and AMF-Harley-Davidson 1972-1978 by Jaap de Jong