Minox

For 50 years, the Minox was the essential spy camera. It could take 50 pictures without reloading, and its high resolution lens captured a remarkable amount of detail. John Walker, a U.S. naval officer who ran a KGB spy ring in the 1970s, used a Minox camera to document American military secrets. The camera is still made today, though not as widely used as it was during the Cold War.