Just another point of view here. I researched the trial from Houdini's perspective. The Hardeen/Negent story was published by Dick Wresch
in his 1961 book The Great Houdini Handcuffs and Leg Irons. I checked many rare books in my own collection written by Harry Houdini, including
America's Sensational Perplexer (@1903-1904), (both editions I have). Then, the Wresch book mentioned the 1922 Adventurous Life, so I checked that
pitchbook as well. Then, I searched Life History and Handcuff Secrets of Houdini, The Life and Adventures of Houdini, Houdini, and also checked
the Kellock biography, Cannell biography, and Christopher's biography. The most information is found in Silverman's biography of Houdini. I'm told
that there is a scrapbook of the trial which was put together by Houdini. In it were all the clippings from the papers during the trials, broadsides
advertising Houdini's victory, and in absolutely none of the above books (except the Wresch book) was there any mention of a Berliner used during the trial, nor any handcuff for that manner. In the first trial he was "chained" and locked with a padlock. See the Silverman biography for the most detailed description of this trial, and I assume since it contains information not found elsewhere the Kenneth Silverman had access to the scrapbook. The second trial he opened a padlock which, once locked, even the key would not open it. The only mention of the Berliner is from Hardeen to Nugent and published by Dick Wresch. I guess my feeling is that if Houdini,who was known to enjoy being photographed in Berliners, did escape from one during the trial that the newpapers or even himself would have written about it. So anyone out there, is there any other mention of a German handcuff being used in the trial? I think this handcuff, regardless of who has it, certainly may have been a Houdini handcuff, but I don't think it was used in the
Cologne trial. I've transcribed Houdini's version of the trial from America's Sensational Perplexer, should anyone care to read it. Let me know.
There is even a photograph of him "as chained and locked in the Cologne trial". The famous German poster of the trial shows him in handcuffs, but it's
an artists drawing, and while one handcuff does resemble a Berliner, it also has a portion hanging down which looks like a Stotz, and another part
shows what looks like a chain. I have a nice repro 1/2 sheet of that poster, and it's better and more detailed than the ones in the books.
Anyway, it's interesting. John