I bought a box of old photo gear at an estate sale, mostly because this camera was in it. It's a Praktina FX made by the German company Kamera-Werke in the 1950s with a CZ Jena 58mm f/2 lens in nice, working condition. That's Praktina with an "N" - not a Praktica with a "C." The two brands are related but the Praktina is a different beast with a different lens mount (rotating breech type similar to early Canon mounts). The Praktina is historically significant because it is the first 35mm SLR which can truly be called a system camera with interchangeable finders, focusing screens, camera backs, motor drives and, of course, lenses. That little window to the right of the "Praktina" logo is a direct-view viewfinder. The subject can be viewed either through the normal SLR prism or through the viewfinder.