I followed your example and watched L’oro dei bravados last night (my sixth consecutive night at home due to the COVID-19 crisis; I really don’t know how long I’ll be able to stand this). The film’s title seems to be a conjunctive derivation of L’oro di Mackenna (Mackenna’s Gold, J. Lee Thompson, 1969) and Bravados (The Bravados, Henry King, 1958), both starring Gregory Peck. Watching it was a rather bumpy ride, since I had found only two very bad versions of the movie, one in Spanish, the other in French.
A post found on two forums, Western Maniac and Western Movies, supports the assumption that Renato Savino at least co-directed L’oro dei bravados: « [Jean-Pierre Jumez] raconte dans son livre comment ils ont abusé le réalisateur Don Reynolds (Renato Savino) […]. »
Nice movie-poster art by P. Franco (Franco Picchioni):
(Larger image in the database, courtesy of Phil_H.)