Nikon Varifocal Viewfinder Type I in excellent condition. Early type with parallax correction on the foot of the finder. This particular example is the rarer version with index marks for Leica 7.3cm and 9cm lenses in addition to the standard Nikon 3.5/5/8.5/10.5/13.5cm marks. Excellent cosmetic condition for its age, with some paint loss around the front internal element. Optics are free of issues, with only minor dust.  Includes original box, case, and instruction leaflet.