Antonio, you ask a few questions about this camera in the wiki entry, maybe i can try to answer them so it can be updated with more current info:
This is a commercial version, after the end of USSR, in early to mid 90s, KMZ factory became privatized and was looking for ways to make profit, this was an attempt to reuse old technology easily to sell to a consumer. It was also later became an item that Lomography.com would sell via their web site.
https://shop.lomography.com/en/zenit-mf-1?country=us
It is indeed quite uncommon to find one nowadays.
Best regards,
Vlad.
03/16/2018 16:15