Minox Transparency Negative Viewer Cutter Accessory for 8x11 mm subminiature film
As the name suggests this tool can allow the magnification of Minox-type film for viewing and slice an individual image (negative or slide) from the film strip. This would allow the slide film image to be mounted for projection or the tiny image be stored or concealed. This was a commercial item produced by Minox, but it had potential clandestine application as did most Minox gear.