Looking further into the brochures in 1968 the frame was called a C-220 (CUB) and if you look at the Bikes the 1968-69 don't use the same clutch guard as the 1970. The frame for 1970 has the bracket for the guard welded to the rear inside down tube. Which his has that bracket making it a 1970 Chopper. Here is a picture of a 1968 model. I don't have a scanned picture of a 1969 but they are the same.