Anyone Seen One Of These: Nikon 13666?

[Monty16!]

I recently purchased some vintage photography equipment. One of the items is a puzzler, both to me and the seller. It is prominently labeled "Nikon 13666." It is a lighted, bench top device, and appears to be used to view film / negatives. There is a cord attached, with a 2-socket "din" type connector on the free end. I believe this would connect to a DC power source to power the internal light. I'm hoping that someone may be familiar with this, and be able to ID the item's function. Any assistance would be greatly appreciated. Thanks! - Monty16

 

[KmH]

Could it be a Nikon microscope accessory?

 

[Monty16!]

I didn't even know Nikon made microscopes, but upon further review, that's exactly what this is! Thanks so much for your insight!! - Monty16

 

[dxqcanada2]

Nikon’s Museum of Microscopy

Nikon’s Museum of Microscopy | Model M Inverted Microscope

 

[astroNikon]

Nikon makes a lot of equipment for the lab.
==> Industrial microscopes | Nikon Metrology

from the above, scroll down to the PRODUCTS menu at the bottom to see the industries they are in. Yes, they're just not cameras.
Industries
Automotive
Aerospace
Medical
Electronics
Universities / Research / Other
Material analysis

Products
Laser scanning
Coordinate measuring machines
Non-contact gear inspection
Portable measuring
X-ray and CT inspection
Shop floor inspection
Large volume metrology
Video measuring systems
Optical measuring systems
Industrial microscopes
Semiconductor inspection
Software

 

[KmH]

Nikon also makes step & repeat cameras (steppers), a device used in the the complex process of photolithography for the manufacture of integrated circuits - like digital camera image sensors.
Sony uses Nikon steppers to make their digital camera image sensors.