I recently discovered a ARFO 2 with lens Ica - Novar Anastigmat 13.5 cm F6, 8 and I would pray a lot to tell me an idea of how it would be worth because I want to sell. You can make offers if interested.
I bought a few like this in poor condition but with original lens and shutter under $100 for restoration.. this one doesn't seem to have original lens/shutter (I think that's a German shutter as well on it, it's hard to tell since half of the speed plate is missing, but it's possible it's ARFO shutter just someone screwed on the German lens). Hope that gives you the idea. In excellent condition with all original parts these go sometimes $500 and up.
I read on a Russian website specialized lenses that were manufactured ARFO first German and then were replaced with Russian ones. (Http://www.photohistory.ru/1207248170510456.html) Anyway thank you very much for information!