Fritz Bagge in his Fiat Eigenbau in 1952
Besides Fritz Bagge I have found three other drivers who ran in 1952 with Fiat at Dessau, Werner Gaudigs, Max Neuber y Harald Kuchen. Trying with this names I have found a photo in a french forum that suggests that the puzzle driver could be Werner Gaudigs.
So I will try Werner Gaudigs, Dessau 1952, FIAT-NSU.
If I am right thanks to D-type for giving me the clue and let saco unlock.