This "Fangio" saddle is the same as my other perforated cyclocross saddle, Soffatti Professionale branded.
Both are made in Spain by Arius and derived from the model Special Gran Carrera.
Fangio used to be a Belgian bike brand, also sponsoring small pro teams and labeling Alan frames with Fangio name.
So, it's not that strange that Fangio had some saddles made with their own logo for cyclocross bikes.