I had the chipper as a kid, and renovated a chopper at least in part a decade or so ago.
The chopper is so cheaply built im surprised any survived the 70’s.. Really poor welding, The first model, the Mk1 had straight right angle for seat and chain stays and many snapped at that point. The Mk2 overcame it by adding a curve on the seat stays. But overall it was just shite
Plus the concept of having cow horn bars, a tiny front wheel and zero reach stem made handling really bad.