While Chuck has not yet fessed up to this being an April Fools Day prank, there are clues here that tell us this is not a real Houdini lithograph. You might notice Houdini's body is actually that of Howard Thurston from a Levitation poster (cleverly reversed). And Houdini's head is from his 1914 Buried Alive lithograph, as is the typeface.
The subject, the Vanishing Elephant, is very well chosen, because there is famously no known poster for this iconic Houdini illusion. But if one ever surfaced, it would probably look a lot like this, so thank you Chuck!