I remember the Fantic's well, that would be early 70,s
Thanks Welsh
You're like a walking dictionary 
Any idea what the original motor was on these bikes (choppers)?
Two sizes, a 125cc and the original 50cc!!!!!!
A buddy of mine had money, he raced the 125cc Fantic in the bottom pic, state of the art then, I had a heavily modified DT175 in those days racing Enduro,s ride there on 2nd hand Knobbies race and ride home again. Did not get the best "A" levels (Only Pure Maths, Applied Math,s and Physics) as I worked a couple of days a week on building sites to pay for the bike bits and beer when I was supposed to be in school.

Welsh

The menace is loose again running loud and fast on the early morning freeway, low in the saddle, nobody smiles, jamming crazy through the traffic and ninety miles an hour down the centre stripe, missing by inches ... like Ghengis Khan on an iron horse, a monster steed with a fiery anus, flat out through the eye of a beer can and up your daughter's leg ..."