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By December 1918 the first chapters of The Master Mystery had been released to theaters, so I don't know why the magazine uses this title, nor where it came from. As it says; "It's a Mystery."
Speaking of the Automaton, last year some side panels from the 2017 Houdini Pinball machine sold on eBay. On one side you can see the Automaton and his...Automawoman?
Below are a few more links for the Automaton aficionado.