Holy crap, I have been using Nikon for almost 4 decades and I never even knew this lens existed! It is an ULTRA-Micro-Nikkor no less! None of that pedestrian regular Micro Nikkor crap. It is of course in M39 filter thread, so maybe I could get it and put it on my enlarger
Nikon Ultra Micro Nikkor 55mm F 2 0 | eBay
Nikon Ultra Micro Nikkor 55mm F 2 0 | eBay