This item is a Nikon Series E 100mm f/2.8 Telephoto Prime Lens. It is in great condition except that there is a smear (?) of some kind behind the rear element. It looks like it was serviced and the rear element wasn't cleaned properly afterward. I am pretty sure it is not fungus or haze. It looks great cosmetically, otherwise. The aperture blades are clean and work fine. The focus is smooth. I am selling it AS IS, no returns.
The front element is fine. I forgot to remove the UV filter. I redo the pictures as soon as I can.