Serial Numbers — Industar 22

Early Industar-22 lenses are often harder to date precisely because they did not always incorporate the year into the serial number Consecutive Numbering:

This is a fascinating niche topic. The is a Soviet collapsible 50mm f/3.5 lens, directly inspired by the pre-WWII Zeiss Tessar. Unlike modern lenses, Soviet optical plants had a chaotic serial number system that can actually tell you when and where your lens was made. industar 22 serial numbers