This is a 35mm Single Lens Reflex camera called the Riwa.  It is a one of a kind prototype that was likely produced sometime before 1945 in Klosterlichfeld, West Germany.  It features an interchangeable 39mm screw mount with a 5cm f/2 Rodenstock Heligon lens and a focal plane shutter with … Continue reading Klosterlechfeld Riwa (unknown)