Rare Nippon Kogaku (Nikon) EL-Nikkor 5cm (50mm) f2.8 Enlarging Lens [EXC+]

According to the web, this is 1956. It is not marked "Nikon" and the 5cm f2.8 is very rare. I can only find a couple of mentions online and none available.

It is in excellent condition with very light wear and works perfectly. The glass is clean and scratch-free with no haze, fungus, nor other issues. The aperture is smooth.

The plastic bubble is included.

SKU: 240506-16