This is a Nikon magnifier. It attaches to the eyepiece of cameras like the Nikon F, magnifying the center of the viewfinder. It has been stored on a shelf for a long time and is a new, unused item. There are no noticeable stains or damage. Please check the images for details. As it is an old item from the Showa era, there may be areas I haven't noticed. Please refrain from purchasing if you are concerned.