This is a black model, rarer than the green one. It's in good condition with no cracks, chips, or malfunctions, and no engraved name. The nib width is F (Fine). It's a well-balanced nib, not too thick and not too thin. This is a rare model that is no longer available new. Many pens on the market haven't had their functionality checked, or are broken, but this pen has been tested and is in working order. If it turns out to be a fake, I will provide a full refund (including shipping costs). Please note that this listing is for the pen body only. If you would like the box as well, please let me know, and I will sell it to you for an additional 2500 yen. The "Pelikan 400NN M&K" was manufactured in 1973 by MERTZ & KRELL, a Pelikan affiliate at the time, in response to the Japanese market's demand for a re-release of the masterpiece fountain pen 400NN from the 1950s-60s, making it a relatively young vintage pen. However, you can fully enjoy the charm of vintage fountain pens, not only with its classic form but also with its ebonite feed and the tasteful color of the barrel. Furthermore, the softness of the nib varies greatly from pen to pen, and finding the writing feel that suits you is one of the unique pleasures of this fountain pen.