the FIA, forerunner of FISA, as the premier single-seater racing category in worldwide motorsport to become effective in 1947. This new "International Formula" was initially known variously as Formula A, Formula I, or Formula 1 with the corresponding "Voiturette" formula being titled Formula B, Formula II, or Formula 2. When the 500cc formula was internationally recognised as Formula 3 in 1950 it was never titled as "Formula C" so the three International Formulae were then "officially" titled Formula 1, Formula 2 and Formula 3.

In the