The R/T Rokon in the museum is a 1975 model. It still has the high pipe and conventional suspension. New features were a beefed up frame at the steering head, a 21" front wheel (spokes available as options over the mags) and a plastic tank. The 76, in addition to the changes from the '75, had a low pipe(!), laydown shockers and the later ribbed longer travel Betor forks. The pic of the Kenilworth bike is of a 76 model. My bike pictured by Geoff and Tony is a 76 model.
The 73 and 74 models were very similar to each other.
So the question is, where's that bike now?