I think you are right Ulrich I vaguely remember reading somewhere that production was moved from Kmz? or Komz? to Arsenal hence the differing years of production and names, hopefully someone can fill in the details. As an alternative to selling the lens, Alex (hk300) is selling m42-pk adapters on mflenses with the inner flange that pushes in the aperture pin and turns auto only m42 lenses to pre set for euro15 or usd17. Apparently his gear is fom Hong Kong and very good quality, I have one on order and want to use it with my Zenitar m2 on my digital slr, will let you know if its any good

Samsung GX-10,too many Russian Lenses, A lot of Zenit, some Yashica,and a Pentax Body also finally a Minox35GT