In which 1964 film did Clint Eastwood first play 'The Man With No Name'?

"A Fistful of Dollars" is a 1964 Spaghetti Western film directed by Sergio Leone and starring Clint Eastwood in his first leading role, alongside Gian Maria Volontè, Marianne Koch, Wolfgang Lukschy, Sieghardt Rupp, José Calvo, Antonio Prieto, and Joseph Egger. The film, an international co-production between Italy, West Germany, and Spain, was filmed on a low budget (reported to be $200,000), and Eastwood was paid $15,000 for his role.

Released in Italy in 1964 and then in the United States in 1967, it initiated the popularity of the Spaghetti Western genre. It was followed by "For a Few Dollars More" and "The Good, the Bad and the Ugly", also starring Eastwood. Collectively, the films are known as the "Dollars Trilogy", or "The Man with No Name Trilogy". All three films were later released in sequence in the United States in 1967, catapulting Eastwood into stardom.

The film has been identified as an unofficial remake of the Akira Kurosawa film Yojimbo (1961), which resulted in a successful lawsuit by Toho, Yojimbo's production company. In the United States, the United Artists publicity campaign referred to Eastwood's character in all three films as the "Man with No Name".