The Washington Post, Feb 7, 1951, WMAL-TV – 6:45. "Yesterday's Newsreel" includes films of Theodore Roosevelt, Theda Bara, Harry Houdini, 1932 Olympics and second Johnstown flood.
Los Angeles Times, July 6, 1953, p 24: Producer George Pal brings a movie of the famed Houdini in his spectacular under-water escape stunt when he guests on Art Baker's "You Asked for It" show, KECA (7) at 8 p.m. [This appears to be footage from the 1953 Houdini movie and not the real Harry.]
Washington Post, July 19, 1953, 7 p.m. – WMAL-TV. The life of magician Harry Houdini and his fabulous escapes is presented because "You Asked for It."
Los Angeles Times, Dec. 4, 1960 (listings for Dec. 9): [channel] 13; Danger Zone (30 min.) Pappy Boyington shows films of some famous freak accidents, including the collapse of the Tacoma Bridge in 1940; the crash of a B-25 into the Empire State Building; and the late Houdini is seen in one of his well-known stunts.
Thank you, Bill!
UPDATE: Our friend Joe Notaro has uncovered Master Mystery footage in a 1948 theatrical short series, Flicker Flashbacks. Click to read about that at Joe's blog, Harry Houdini Circumstantial Evidence.