Nippon Kogaku Tokyo Nikkor-H 5cm 1:2 lens No. 5008738 Type 1 c. 1950 in Leica L39 screw mount. Fewer than 1000 rigit 5cm/2 lenses were made in Nikon rangefinder S-mount and L39 screw mount with intermixed serial numbers, which makes this a very rare lens indeed. Very clean lens with clean optics. Smooth focus with minor focusing hick-up between 3-3.5feet. Lens comes as-seen in images with rear cap only.