Day of Anger

Day of Anger is a 1967 Spaghetti Western film directed and co-written by Tonino Valerii and starring Lee Van Cleef and Giuliano Gemma, and features a musical score by Riz Ortolani. The film credits the novel Der Tod ritt dienstags by Ron Barker as its basis, although Valerii and screenwriter Ernesto Gastaldi have attested that this credit was primarily included to appease the West German co-producers, and that although some scenes are partially borrowed from it, the film is not an adaptation of Becker's novel.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.