The Stranger Returns (1967)

Taking the identity of a dead postal inspector found on the trail, a stranger rides into a small western town and finds himself in the middle of a stagecoach robbery perpetrated by a gang of twenty ruthless desperados.

Finding out the object of the heist was not a strongbox as it seemed but a solid gold stagecoach, he enlists the aid of a down-and-out old preacher and tracks down the dangerous gang and their unsuspected ally.