Very interesting components Anton, I suppose they are Russian manufactured items. Or, are they produced elsewhere and imported? The derailleurs look similar to some I have seen in the Disreali Gears website, Disraeli Gears - a derailleur collection, either in one of the old Soviet Bloc era countries or the Soviet Union. They actually make up a decent looking bike, but your purpose is a crocodile single speed, isn't it? Your build thread post is great, BTW.

Bill