Here's a terrific three-part video about the restoration of a rare Harry Blackstone Sr. poster by the talented crew at Poster Mountain. It includes an interview with magic historian, author and collector Mike Caveney, and gives a nice look at his collection. Mike even tells the story of a classic Houdini put-down by Blackstone. Enjoy.
In 2011 Poster Mountain restored a dust jacket for Houdini's A Magician Among The Spirits. You can read the article and see photos of the entire process at the Poster Mountain blog.