Mitsubishi Pencil Oil-Based Ballpoint Pen Jetstream Prime 0.5 Noble Black SXK500905.NBK Brand: Mitsubishi Pencil [Description] This is the Jetstream Prime Special Edition Noble Black from Mitsubishi Pencil Uni. It was released in limited quantities in 2019. It has been opened and used for a few test writings. After the test writing, it was stored in the limited edition leather case. The limited edition leather case is also included. It was purchased from an Amazon online shop, and it comes with a leather case that was part of a buyer-exclusive package.