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The working title of this film was What Nancy Wanted, which also was the name of Sheridan Gibney's screen story. Although flashbacks had become a popular and common narrative device in films by the mid-1940s, the multi-layered flashbacks of The Locket were particularly complex. RKO borrowed John Brahm from Twentieth Century-Fox and Laraine Day from Paramount for the production. Martha Hyer made her film acting debut in the picture, and Gene Raymond made his first screen appearance following five years of military service. A Hollywood Reporter news item announced that Day and Brahm were to make a twelve-city promotional tour for the picture showing audiences how scenes in the film were shot. Actors were to be hired to impersonate crew members, and prop cameras, lights and movable sets were also to be used. According to modern sources, Day, a clothes designer as well as an actress, invented the spun glass fabric that was used for her wedding dress in the picture.