Below is a window card for Thurston's 23rd tour in late 1928. Look familiar? It's strikingly similar to Houdini's now well-known 1926 window card featuring Halloween imagery. There's even an owl perched over the first letter of his name. I've not dove too deeply into this, but it appears this artwork was unique to Thurston's 1928-29 tour.
For comparison, here is Houdini's window card.
So was this a delibrate effort by Thurston to evoke Houdini's show? Could this just be coincidence? Or maybe these elements are part of a basic template used by printers of the time? It's hard to say for sure, but the similarities here are unmistakable.
Reproductions of the Thurston card are available from the Museum Outlets website.