Did Norton (and other bikes for that matter) change from the right shift/left brake to what I assume became the standardized control placement of right brake/left shift in 1975? There is a bike that's listed as a 1975 Norton 850 for sale in this area and has many pics, but they show this bike as having the right side shift. Could that be correct for this bike? It says matching numbers and the asking price is $20,000. That seems way out of the ball park. Is any Norton worth that?