This was filmed in front of Hardeen's house at 394 East 21st Street in Flatbush in November 1917. The Houdinis were living with the Hardeens at this time. Kellar was in town to participate in Houdini's Antilles benefit at the New York Hippodrome on November 11.
This clip comes from a remarkable reel of undated footage edited and complied by Hardeen, possibly for the S.A.M.* It includes some other complete and never-before-seen clips that I will share in the coming weeks.
Thanks to Brad Hansen of Retro Cars Forever for his editing assistance. A playlist of these clips can be found on the WILD ABOUT HARRY YouTube Channel.
* UPDATE: Escape artist Rick Maisel informs me that he owns this original reel of film. According to Rick, the footage from came from the "rarest of the rare" Houdini-Dunninger collection that was sold through Joe Tanner. Rick has kindly granted me permission to continue to share select clips here on WAH, so get ready to see some great Houdini (and Hardeen) film. Thank you Rick!