Hi Vlad,
I bought an EFTE-2 on Ebay several years ago and I saw an ARFO also, but the condition was very poor (totally trashed) so I did not buy it. They are both rare and although there are high production numbers quoted in Princelle, I suspect that nowhere near that number was actually produced. They are the kind of camera that doesn't survive over the years easily because of the bellows and I'm sure many were discarded when the bellows became damaged. But if there were a million Fotokors produced and 130,000 EFTE & ARFO cameras produced, then you would expect to see one of them for every 10 Fotokors, and that isn't the case.
The EFTE and ARFO cameras were "5 Year Plan" cameras and so I have I think that it's possible that the production numbers may have been exaggerated in factory documents.
In any case, my EFTE-2 has a German lens (Rodenstock, Munchen /Doppel Anstigmat Eurynar / 13.5 cm - f. 4.5)and an AGC IBSO shutter, both of which look to be original.
Here are some photos:





Regards, Bill