Many thanks for that information. Very helpful.
The Pilot pen is model number FD-2000P-BN. It is a late 80's pen and still in the 1989 catalog. The orginal sticker price was 20,000 ¥. You can go to Ryojusen Pens and look under ephemera. There is a PDF copy of the 1989 Pilot catalog and you can find your pen there.