This is the Newer  Version of the Zeiss Ikon Model A 520 in 4 1/2 x 6 format, 16 pictures to a roll of 120 film. The viewfinder is upgraded to a two element optical,  the film number indicators have a sliding light cover, and the shutter release button is added to the body.  It is covered in  leatherette and has the Novar Anastigmat  1:f3.5
f 7cm lens, made by Rodenstock.  It takes great pictures. Like all front focus lenses, when focused close, there is some radial distortion when opended wider than  f8.
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Zeiss Ikon  Model "A" 520 Ikonta