This pen is a Piccolo Cigar model with the Kuro-tamenuri finish and fitted with a music nib, hence the two slits. It accepts standard Platinum cartridges or a converter and comes in its own wooden presentation box.
Quoting from the Nakaya website on this page:
The Cap, barrel and section are made of ebonite lacquerd with Wajima urushi. This model is long size and is supposed to be used without posting the cap when writing. As ebonite is a very light material it is possible to make the barrel thicker and longer. Therefore the balance point can be set easier to provide comfortable writing for everyone. “Tame” means “pool” and “nuri” refers to the lacquer coating process. You can actually see through the layers of clear urushi lacquer as if you were looking into a pool. Wajima artists use “shu urushi” (red color) for the base urushi on the barrel, and “shu-ai-urushi” (semi-transparent brown color ) for the finish coats. The black color is mixed in shu-ai-urushi for Kurotame-nuri. When the process is finished, you can still see the base surface of red urushi. After this coating process, craftsmen polish the surface over and over by hand for months in order to attain greater transparency, allowing you to clearly see the underlying red usurshi surface.
Total weight: 20.0g
Body weight: 15.0g
Total length: 130.0mm
Barrel length: 116.0mm
Total length(with cap): 160.0mm
Max diameter: 15.0mm
Barrel material: Ebonite