[a] He also competed in sports car racing, winning the 1959 Targa Florio with Wolfgang Seidel.

He drove the factory team car in the East German Formula 2 Championship, which he won in both 1952 and 1953.

He was allowed to participate in three events in the West in 1953, including his first appearance in the Formula One World Championship.

His final F1 appearance came at the 1964 German Grand Prix driving a Cooper-Climax for Rob Walker Racing, failing to make the flag.

His son Jürgen Barth became an engineer at Porsche and also went into motorsport, winning the Le Mans 24 Hours in 1977.