This is a Contaflex, made by Zeiss Ikon in West Germany, in 1953. It is the granddaddy of lens shutter SLR cameras. 
This camera has no instant return mirror, and the lens is fixed. In 1954, when Zeiss introduced a version of this camera with a light meter, they called it Contaflex II. The original camera became Contaflex I. Ever more complicated versions of the camera were made until the late 1960s.
I do have other cameras!