I think from the lens stage moement in a 45 series - I'll update once I dig arounf and find out more
Includes:
What you see in the photo
Models may vary so compare this photo with what you are replacing; whenever possible I create separate listings for each variation (ex: blue vs. black models)
See photo(s) - this represents lot, you get next-in-stack - I try to be sure each pair came from the same enlarger originally