The 1916 14 x 22 poster advertised a challenge to Houdini from U.S. Navy Chief Petty Officers to escape from handcuffs and manacles brought to the New York Hippodrome. As this was during the first World War, this could be considered as a Houdini-World War I item. The auction correctly pointed out that most printed matter relating to Houdini's challenges are small handbills, so the size of this adds to its appeal. I also really love the disclaimer at the bottom: "The Challengers have been absolved from all blame in case of accident."
The auction also saw the sale of a portrait photo of Houdini posing with his book, The Unmasking of Robert-Houdin for $420. A 1924 letter from Houdini on S.A.M. stationary calling for a meeting at his home to discuss the issue of "exposures for publicity" sold for $840. (This was an issue Houdini found himself in hot water over more than once.)
The small candid photo of Harry and Bess Houdini, which I speculated here could be the only photo of them at their Laurel Canyon bungalow in Hollywood, sold for $960. It blew away the auction estimate of $200-250 (and my own humble bid -- sigh).
The auction also had an interesting Howard Thurston letter dated November 15, 1926, in which the magician writes:
"Papers are full of Houdini taking his secrets to his grave. You know that is not true and it belittles the remaining magicians."
That letter sold for $1,140.
Among the non-Houdini highlights were an inscribed portrait of Leon Herrmann ($3,360), an Alexander Herrmann Throw-out card ($1,320), and a Harry Kellar "Centipede" poster which brought in the highest price of the auction, $7,800.
Congrats to all the buyers.