Mysterious 2 strange Nikon medical micro lenses

Information Wanted

Yes, I need your help. INFORMATION WANTED!!
My Nikon friend, Mike Symons, a vintage Nippon Kogaku specialist, want to identify these unusual Nikon Micro lenses.
These lenses were manufactured in Japan by Nikon.
However, I don't have information about these lenses.
Please contact Mike or me kindly if you have information.

Thank you.

RED BOOK NIKKOR AID INTERNATIONAL
Michio Akiyama

E-mail to ;
Mike Symons/Canada: msymons6456@telus.net
Michio Akiyama/Japan: hfd00673(at)nifty.com

I Need Your Help

Hi Nikon friends, my name is Mike Symons.
I found this unique outfit on e-bay a couple of months ago.
It originated from San Capistrano, California, USA.
I was told that it came from an Ophthalmologist's lab or office.
The Nikon F-2, serial #8050696, is fairly late and came equipped with an MD-2 Motor-Drive, serial #457328.
Unfortunately it didn't come with the MB-1 or 2 battery pack.
I'm led to believe that it was probably attached to a unit that contained its own power source, and thus didn't require the Nikon MB-1 or MB-2 battery pack.
The finder is an F-2 "Special Finder", Model II, and it has been suggested that these special finders were perhaps not made by Nikon although they have a few Nikon parts ...... such as the nameplate and mounting collar.
There is an eyepiece diopter adjustment.
The focusing screen is clear (refer to JPEG image) and has a vertical and horizontal cross grids.
It appears to be a type "M" .... although a bit different in appearance.
The screen itself is mounted in a "K" frame but this is incorrectly marked.

Lens Spec.

The most exciting part of this outfit were the 2 Nikon Micro lenses, described individually below.

6x Nikon Micro lens

Direct Nikon F mount;
Fixed focus lens;
Aperture- f2.6-16 with click-stops between aperture indents;
What appears to be a 9-bladed iris diaphragm;
Weight- 525 grams;
Overall length- 88.10 mm;
Width at aperture ring- 57.40 mm;
Width at front element- 28.40 mm.

10x Nikon Micro lens

Direct Nikon F mount;
Fixed focus lens;
Aperture- f1.4-f8.0 with click-stops between aperture indents;
What appears to be a 9-bladed iris diaphragm;
Weight- 755 grams (appears extremely heavy for its size!);
Overall length- 123 mm;
Width at aperture ring- 57.40 mm;
Width at front element- 24.40 mm,

Now I need help in trying to identify these unusual Nikon Micro lenses......

Cheers,

Mike H. Symons
"Nikon Collector"
Canada

All photos by (c)Mike Symons

Fine collection of Mike Symons