Formula 2 team owner Ron Harris commissioned Frank Costin to build a Formula 2 car in 1967 on the recommendation of driver Brian Hart. The result was a wooden chassised car which featured a bonded plywood monocoque with metal bulkheads. It was light and aerodynamically sleek and proved to be very strong. The cars were raced by Hart and Eric Offenstadt in 1967 and showed well, notably at Hockenheim where Hart finished second.
In August that year the Formula 2 race at the Nurburgring was held concurrently with the German Grand Prix, although the grids were separate. Hart and Kurt Ahrens Jr raced the two Protos and so are credited with having started a World Championship event. Ahrens retired after four laps while Hart finished five laps behind after problems.
In 1968 Harris switched to Tecno Formula 2 chassis.