It's easier to tell you what it osn't than what it is

Identification can be very difficult as there were so many German/European manufacturers of these cameras and some were very short lived.

FEC used the Radionar in a Vario as did Voighlander on a basic model, but you'd need to compare the camera. looking at the hinges.whay the standard moves & locks on the focus track, type of wire finder and sight etc.

Ian