Randy,
Every year in the fall the IAP holds a pen swap between members. Its called the "The Pen in the Hat" or "PITH". In September members volunteer to participate and are pair with another member. The pairs then create a pen and swap with each other.
Its these pens you are seeing refereed to as PITH pens. This one was the one Bucurestean made and sent me. I have pictures of the one I sent him in another thread on the board.
Joe