Ooooooooo... You going to try to see how thin the ice is again?
I honestly don't give 2 ***** about what's C&V. I see it more as watershed years. Large changes in the industry. I suppose they could be used as a definition, but again, I think debating it is silly. Of course the following is an approximation, plus or minus a couplethree years.
1887 - Pneumatic tires and safety bike.
1930 - Lug carving, use of aluminum, modern geometry, derailleurs
1951 - Parallel-o-gram derailleur, groupsets, paved roads
1983 - Indexing, clipless pedals, crabon fiber, aero
On the other hand, I know what isn't C&V. Blue bikes. They suck.
My 1973 BLUE Peugeot UO-8 would highly disagree!