Two photos from the Benelli Club in Italy. They are both 175cc models of 1959, the first year for this style vertical 4 stroke as far as I can determine. Apparently, there was also a 125cc offered of this same design. These then are the beginnings of the Riverside models which grew eventually to 360cc. According to the Italian Club, the 250 and 350 varieties were produced during 1964-65.
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