There are actually two different styles of this same poster. The other features less text, more muted colors, and while it's the same design, it's a completely new illustration. One of these posters sold at Guernsey's in 2012 for $18,000.
This style, which had brighter colors, additional text, and a better likeness of Houdini (IMO), sold at Swann Galleries in 2006 for an astounding $78,000 (with buyers premium). What's also interesting about this poster is it contains an error. The text at the top of the poster says the escape took place in 1903, but the text below reads 1902. The escape time is also different; 5 minutes above and 15 below. That might explain the existence of the second style poster which omits the lower text entirely.
|The two Amsterdam prison break posters.|
Thanks Dorothy and Dick.
UPDATE: So much for "later this year." Dorothy and Dick have listed this poster on eBay now.