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| Circuits | Country | Date |
| Buenos Aires | Argentina | 22nd January 1956 |
| Nürburgring | Europe | 5th August 1956 |
| Indianapolis | USA | 30th May 1956 |
| Monte Carlo | Monaco | 13th May 1956 |
| Reims | France | 1st July 1956 |
| Silverstone | Britain | 14th July 1956 |
| Spa-Francorchamps | Belgium | 3rd June 1956 |
| Monza | Italy | 2nd September 1956 |