They Call Me Hallelujah (1975)

A Yankee gunman, Hallelujah, is hired by Mexican Juarista, General Ramirez to confiscate a case of jewels to fund the revolution. For this, Hallelujah will receive a percentage. But other parties are interested in the case and when they turn out to be fakes, it all deteriorates into a cat and mouse style game with Hallelujah, gunrunners, the French, and a Russian outlaw(!) all searching for the real jewels. - SWDB