This is a fairly rare fisheye lens in Nikon Non-AI mount for the F or F2. *Note that this lens CAN NOT be mounted without the mirror locked up. The rear element extends into the mirror's space and can cause damage if the mirror is not locked up. Since you can not use it in a typical SLR fashion, the lens comes with the paired 7.5mm viewfinder for framing.
It also has cool built in filters (since the front element extends out, typical of fisheye lenses. There is an L1A along with yellow Y48 and Y52, orange O56, and Red R60 for black and white photography.
This would be an excellent addition to a classic Nikon F or F2 kit. A lot of bands are shooting fisheye pictures again, and this would be the lens for it.
It is in excellent condition with light wear. The glass is clean and scratch-free with no haze, fungus or other problems. The aperture and internal filters are clean. The viewfinder is in great shape as well with clean glass.
The original lens caps are included as well as the screw cap for the viewfinder.