I guess i lose a point here. My initial information labels it as a Gerosa with a Minarelli engine. Now I search more and find that initially Gerosa made their own engines, then mid 60's switched to Minarelli engines then for the last 2 years of production they used Zundapp engines. This model being a 1974 and 1975 being their last year od production - well, it is a Gerosa Zundapp.
I guess I owe a point to grossohc for misleading him and the quiz point goes to Ryan.
Sorry guys.