How many movies have Carlo Simi and Sergio Leone collaborated on?

They have worked on 9 movies together! Their first movie together was Duel of the Titans (1961) while their highest rated movie together was The Good, the Bad and the Ugly (1966). They have not worked together since Once Upon a Time in America (1984). They are most known for their western films together.

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El Paso Bank Manager (uncredited)
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Whistling Bounty Hunter (voice) (uncredited)
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