A new fountain pen brand "PROCYON" was created from the platinum fountain pen. "PROCYON" is derived from one of the 21 stars in the whole sky, "Procyon", a star in the constellation Koinus. A fountain pen designed with an unprecedented new form based on the concept of a shining fountain pen. Functional aspects are also substantial. Equipped with "Slip seal mechanism", a mechanism unique to platinum fountain pens. Even if you haven't used it for a while, you can always write it out and write it in fresh ink. Equipped with a newly designed pen core for easy ink suction. When suctioning ink using a converter, it is now possible to do so without having to completely immerse the pen tip. Other features include an aluminum body with an optimal weight balance design and a pentagonal aperture pen tip. Stimulates "writing joy", and the special paint and vivid color development that adapts to the skin stimulate "holding joy".