Two Sons of Trinity (1972)

Original title: I due figli dei Trinità

Franco and Ciccio are two cousins ​​who, in the old West, have opened a service station, where they carry out the washing and drying of the horses and a bar service for the passing riders. One day a stranger saves them from an attempted robbery against them: the girl introduces herself as Calamity Jane, as well as Franco and Ciccio's aunt.