I continue
What I found starting from your below post
Indeed the 1956 Sverige GP
raced by August 12th consisted in two races
An opening race of 104 kilometers long, dedicated to the tourist cars mostly Mercedes 300 SL Gullwings, Alfa Romeo and Porsche 356 Carrera
and a 1000 kilometers sport cars GP 5th round of the 1956 FIA World sport cars championship
27 cars entered this race mostly Ferrari's, Maserati and Jaguar D type as seen on this pre grid pic
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