Helios 44-2 58/2 Zebra copy of Carl Zeiss Jena Biotar 58mm f/2. The most complete information about the version of the Helios lens models, we can find at this link. http://forum.mflenses.com/complete-list-of-helios-lenses-getting-closer-t26100.html This model has a serial number beginning with the three zeros at on the basis of information from the link below: http://forum.mflenses.com/viewtopic.php?t=3332 suggests that this is a pre-production model. According to the markings on the lens ( http://cameras.alfredklomp.com/logos/ ) has been produced in a factory MMZ : Minsk Mechanical Factory. Founded in 1957, MMZ was located in Minsk, Belarus, approximately 450 miles SW of Moscow. In contrast to the previously tested by me Helios 44-2 ( http://m42lens.blogspot.com/2013/07/helios-44-2-58mm-f2.html ), which have anti-reflective coatings in purple has antiglare coating in yellow. The quality of the lens is higher than previously tested Helios Lens. Precision workmanship and qu...