Retro 51 Thirtieth Anniversary Ballpoint Pen

This pen comes in it's orginal tube.  Here is what is unique about this pen.

1. Top of the pen has a pearl inlay.
2. Aounf the circimfrence of the twist where it normally would say "Retro 51 ####" This pen says "Tornado GK Private Stash".  Wonder what that means?  :)