Gold Diggers of Broadway (partially found musical comedy film; 1929)
From The Lost Media Wiki
Gold Diggers of Broadway is a 1929 American musical comedy film directed by Roy Del Ruth and starring Winnie Lightner and Nick Lucas. Distributed by Warner Bros., the film is the second two-color Technicolor all-talking feature-length movie.
even though it made $2,250,000 at a box office during its time, the film had been completely lost until 1986 and as of now 2 incomplete reels 9&10 and few fragments have been yet to resurface.