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In page William Duncan (actor):

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He began to act in silent films, and had roles in hundreds of serial episodes, many of them Westerns. His career spanned the change to "talkies", and he acted from 1911 to 1940. When William Duncan joined Vitagraph, his contract was worth $1,000,000 a year. He was better paid than Mary Pickford and Douglas Fairbanks. He appeared in films with Olympic swimmer Buster Crabbe (who played Flash Gordon in the 1930s).[1] He was also a prolific writer and director of films.[citation needed]