I'm curious about the significance of the year 1972 in vintage racing? Was 1973 the beginning of some major changes in sportscar racing? It seems to me that when cars are grouped by their year of production or preparation level that the years separating the cars should be years of major changes. For examaple if 1973 was the first year body panels could be fiberglass then it makes since that 1972 is a cut off date when classing cars. Gladly I can say that this was all before my time so maybe Jack or Colin can give us a history lesson on this topic. I think VMC is a group that oversees member sanctioning bodies and attempts to keep preparation levels similar between sanctioning bodies. Is this correct? If so was it just a matter of one sanctioning body arbitrairly picking 1972 and those that followed kept the date?