This is the waist level finder for the RB67. The waist level makes the camera smaller and lighter and leads to a more contemplative style of photography. You look down, like reading a book, rather than holding the camera like a gun.
This one is in good condition with moderate wear. The magnifier has a series of marks on it but they are not visible while sighting through it, they do not affect the magnifiers function. The leather also shows heavy wear but it is only cosmetic.