Ride Him, Cowboy (1932)

John Drury agrees to look for the outlaw known as the Hawk and Henry Simms volunteers to help him. But Simms is the Hawk and he leaves Drury on the desert to die. Simms then kills a man and plants John's harmonica at the scene. With the help of his horse Duke, John returns only to find that he is accused of murder and about to face the hanging Judge.