Guess I missed this clue earlier. Now I know what it is since I can read the Russian. "It" was produced from 1955-1979. Rustem says he remembers it being in the stores when he started photographing as a teenager, but this was an expensive model which his Mom couldn't afford despite being a rocket scientist. 2,232,245 of them were produced - not so many considering the massive production of that time. How'd you come by it?