For Italy the original running time turns out to be 94 minutes, which probably explains why in the DVD and TV version (from RaiMovie) credited Luis Gaspar doesn’t seem to be in the movie.
If IMDb is right in Spain the film was released on 21 February 1972, about four months before being submitted to Italian censorship.
It’s not the same set, Arizona Returns was mainly filmed at Elios (see post above)
I wonder who had the idea: Rafael Romero Marchent - also director of Garringo and ¿Quién grita venganza? - and his brother Carlos or Set decorator Demofilo Fidani and his daughter Simonetta who shortly before worked with Steffen in A Man Called Django?