Kato Seisakusho Pen? I was given this today by the friend I refurbished a couple pens for. No brand name or anything but the words "Special Irium Pen" on the nib which seems to be gold plated but the plating has worn off of most of the nib. No nipple for a sac and does not seem to be a cartridge pen......I'm lost.Kato Seisakusho evidently passed in 2010.I guess I need to now find out the filling system so I know what to do.