Beautiful Colorado scenery and a fine attention to detail in this western set in the late 1860s.
Several American attempts at a spaghetti western surfaced in the late 1960s: this one is a much more compelling film than Eastwood's "Hang 'Em High", in that all of the lead characters are well-drawn and mysterious.
Van Cleef, in his finest lead, plays the title character, a man more interested in protecting his barge than in the well-being of the "squatters" who populate the town. Oates is a bit hammy as Remy, but an effective psychotic villain nonetheless.
Tucker practically steals the film in a role that would have gone to Edgar Buchanan two decades earlier, that of Mountain Phil, a man loyal enough to put his life on the line for his best friend, and who holds the "squatters" in even more contempt than the barquero does.
Should be on DVD by now. An overlooked gem that anticipated "Tom Horn", "Unforgiven", and other stripped-down westerns that would follow over the next 25 years.