Afraid I have no idea, Raid. I'm pretty much just a lens user, not a guy who knows either the history or how the bloody things do what they do - But I discovered the Helios because I bought a sharp looking black painted Kiev 4AM. The camera itself was no good and went back, lens and all for a refund, but I went right back out to the bay and bought another copy that would ship with the Helios.
I need to use that camera more. But I hate the required backwinding to keep the frame spacing consistent.