Most high grade 6x9cm folding camera of Balda made, Tessar 105mm F4.5 with Compur shutter. It has a coupled range finder and automatic parallax compensation which is scarce functions for the camera of this age. It is able to take both 6x9cm and 6x4.5cm pictures. It requires the metal mask which should to be set before film loading, when 6x4.5cm size.
The view finder is always masked for 6x4.5 view, so 6x9 sight is divided three frames by vertical bars. You feel as if you were looking outside in the jail when you see into the view finder.