The word classic can be used as part of a retronym or as the part of the name for something new that is marketed on its similarities to something older.
When I think of words Harley and Classic, I think of the Electraglide. I suppose because it came before the others, that and the fact that I have had four of them. JMO
A retronym is a new name for an object or concept to differentiate the original form or version of it from a more recent form or version. The original name is most often augmented with an adjective (rather than being completely displaced) to account for later developments of the object or concept itself. Much retronymy is driven by advances in technology.