Trying to identify a spy movie with Donald Pleasence

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http://forums.fedoraforum.org – I seem to remember a spy movie where Donald Pleasence played a spy that went on a mission wearing a false eye that was a hidden camera. He returns from the mission and takes out the eye and develops the film in the eye which contains photos of documents. I've looked through his filmography on imdb and can't seem to figure out which one it is. (HowTos)