I’m looking forward to some info on this lens history. First of all the exact market introduction date…
Please refere to the website PENTACONSIX.COM for any info about these lenses, there are two different mounts that I personally think were given with a throw of dices along with the name, Kiev66 Kiev88, Pentacon six, Kiev 60 etc. In my opinion, they are all the same mousetrap, zero reliability lower than zero usability but good lenses. some are box-like, like Hasselblad and the cloth shutter usually explodes in your face if you do not make all the procedures in the right order, the other is a clumsy reflex-like piece of rusty iron and cheap plastic, that overlaps photos when it works. If you want to discover which is good for your camera I take zero responsibility, and please go to proper soviet mousetrap experts