1975 Spanish Grand Prix
It was the 21st Spanish Grand Prix since the race was first held in 1913. It was the fourth, and last, Grand Prix to be held on the Montjuïc street circuit. The race was shortened to 29 of its scheduled 75 laps, a race distance of 109 kilometres. The race was won by German driver Jochen Mass driving a McLaren M23. It would be the only Formula One win of his career. Mass had just a second lead over the Lotus 72E of Belgian driver Jacky Ickx when the race was declared. Argentine racer Carlos Reutemann was declared third in his Brabham BT44B, a lap behind the race leaders after a penalty was given to Jean-Pierre Jarier. This was the final win by a German driver until Michael Schumacher won the 1992 Belgian Grand Prix.
Argentine Grand Prix
The Buenos Aires Grand Prix was an event first started in 1930 as a sportscar event held at the Costanera circuit until 1940 and switched to the Retiro circuit for 1941. After a six-year break and by then Juan Peron in office, racing resumed in 1947 at Retiro with the start of the South American "Temporada" Grand Prix series, competing twice that year under the Formula Libre regulations. Italian Luigi Villoresi won all 1947 Temporada events. The race regularly attracted Brazilian and European drivers and also Argentine drivers competing in Europe, such as Juan Manuel Fangio and José Froilán González. For the 1948 Grand Prix season, the race was moved to the Palermo circuit where it would remain to host six of twelve "Peron Cup" races until the end of 1950. In 1951, the Costanera Norte circuit would host its last three Grand Prix events before completion of the Autodromo 17 de Octubre (October 17), a purpose-built circuit where the championship Formula One Argentine Grand Prix was held on different variants of the facility from 1953 to 1960, 1972 to 1981 and 1995 to 1998.