McLaren M20 Helmut Kelleners Interserie Silverstone 1974 5x7" photo

5x7inch (125x175mm) amateur snap shot of Helmut Kelleners' ex works  Can Am McLaren M20 Chevrolet  in the paddock at the 1974 Silverstone Interseries Martini Trophy event 
Recently printed up in a professional photo lab from the original amateur slide