This is a fun movie with interesting characters, and lots of spaghetti western style. I found it very entertaining, although it has some story elements that don't seem to make a lot of sense.
George Hilton does a fine job of portraying "Sartana," the bounty hunter/detective/vigilante more often played by Gianni Garko. Hilton's style is slightly different, but he plays the part equally as well as Garko. The real show-stealer here is Charles Southwood as "Sabbath," a bounty hunter who dresses in all-white, carries a white parasol, and lives by the values taught to him by his mother. Sartana and Sabbath are both oddballs, each in his own way, but Sabbath is so eccentric he makes Sartana look normal. One of the many amusing parts of the film is when Sabbath comes riding into town with his parasol, and one of the townsfolk sees him and says "what's the west coming to?" Sartana and Sabbath play off of each other quite well, and their interactions are fun to watch, especially when they square off near the end of the film.
A great music score by Francesco DeMasi, along with some excellent camera work, help make this euro-western above average in the style department, but the somewhat muddy plot doesn't do it justice. It's basically about how a crooked town boss is taking gold from the local mines and replacing it with sand before it is shipped. Then he hires Mexican bandits to "rob" the shipments so that nobody will know that they were ever replaced with sand. In comes Sartana to save the day, though his motives for wanting to find the gold are selfish. A little while later, Sabbath shows up, supposedly for the same reason. That much is pretty cut and dry, but the problem is with the details. While the basic idea of the scam going on with the gold is easy to understand, some of the actions of the characters in the story don't make any sense, or perhaps aren't explained very well. Maybe the American version is poorly edited. That would explain a lot, but I don't know if it's the case.
The best way to watch it is to sit back, relax and enjoy the cool characters and style of this spaghetti western without trying to make sense out of everything that happens. When viewed with that attitude, it's actually one of the more memorable and entertaining films of the genre.