EL-Nikkor 360mm f5.6 Enlarging Lens N6020

Description

Amazing lens here, and very rare!
This lens was sourced from a large commercial lab where it was tasked with making all the 12' murals for the last 40+ years.  These prints hang all around the globe in various corporations and retail environments.
No information is out there on this guy, I believe it was made in the mid 70's, and was pricey!
Even being that old and having seen almost daily use this lens is pristine!  It has some light dust on it from being in storage the last few years, please see all photos.
It is mounted on a HK board, 9.25" in diameter.
Lens functions as new, all operations are smooth.
The only flaws I can find on this lens is what looks like scratches on the aperture blades.  They do not affect the function of the lens but because the lens is so large they are easy to see.  Please see all the photos. The pots that show up on the aperture shot are dust spots on my cameras sensor, not the nikkor lens.
Nikon F2 in last photo is not included in the sale, it's just there for a size reference.  This lens is massive!  Front element measures 120mm.  Includes front and rear lens caps.