Looks like a 1968/69 Benelli Mojave 350cc but I am not an expert in this model.
Four stroke 356cc engine marketed in USA by Wards Riverside.
Nice bike! Styling copied from the Rickman Metisse off road bikes!
Ian..... hit the search button with your suggestion and you look spot on! Interesting bike. I don’t need another one, but may go and have a look. If I end up with it, it will be on you! Cheers, John D.