FIA Masters Historic Formula One Championship
The FIA Masters Historic Formula One Championship is a championship that has old Formula One cars from "the golden era", which caters for 3-litre engine Formula 1 cars, from 1966 to 1985. The Historic Formula One Championship, previously known as the Thoroughbred Grand Prix Championship, was a championship for Formula One cars built during the 1960s, 1970s and 1980s.
Source: Wikipedia — FIA Masters Historic Formula One Championship (CC BY-SA 4.0)