This is a Zeiss Ikon Nettar 515-2 Folding Camera with a Novar-Anastigmat Derval Lens with Leather Case
Derval Lens: 1:6.3 F=10.5 cm
Inside is marked Zeiss Ikon Film - B2 - 6X9cm 2 1/4 X 3 1/4"
The black paint on the outside of the camera is flaking off. The inside looks clean and nice compared to the outside. Bellows are in great shape.
This camera is for collectors. Finding film for this camera will be very difficult.