I just found this, I used to have a decent amount of Nikon F and F2 accessories. The official name was Sportsfinder F. This isn't perfect, but it's quite nice, and comes with the original leather case as well.
I use flash in all my pics so that you can see any defects; I'd rather you be pleasantly surprised with the condition of the things I sell, rather than being disappointed. Little bit of brassing, mostly on the right upper side, tiny impression to the metal on the front. Optics are perfect and coatings very good (I've cleaned off the small fingerprint on the next-to-last pic).
The item "NIKON Black Action / Sports finder viewfinder (SPORTSFINDER F) with leather case" is in sale since Tuesday, March 06, 2018. This item is in the category "Cameras & Photo\Camera & Photo Accessories\Viewfinders & Eyecups".
The seller is "nartox" and is located in Phoenix, Arizona. This item can be shipped worldwide.