The poster is in the collection of Ken Trombly. Ken was one of the guest speakers at the ObscuraDay event in D.C. today. Ken has a HUGE collection of Houdini items, posters galore, and photos and postcards as well. He's got a number of things I'd like to write about in the future, so I'm going to keep quiet on the rest. But he told me this poster below was purchased on eBay....according to Ken, "back when eBay was good." So it was a number of years ago. I'll be writing MORE about Ken and his talk, but I wanted you to see this before anyone beat me to it! :)
I would encourage you to follow Ken on Instagram. https://www.instagram.com/magic_posters/
and while your at it, follow ME there too https://www.instagram.com/carnegiemagic/
UPDATE: Joe Notaro alerted me to the fact that not only is this NOT a new discovery, but it's also appeared in three different books, and one of those was in color. Well, lol, it was NEW to me, lol. I do appreciate the feedback though. I love to hear from folks so anytime anyone wants to comment, please do.