Here's my Hapur TK ring. As a matter of fact he made this exact ring step by step here on GDC to show the process. That thread may possibly still be around but this was several years ago. This picture was taken, obviously after I received the ring, and I had re-shaped the skull. His original skull was far too large and mis-shapen. He later altered this on subsequent copies.
If any of you have a copy and want to tone it for age Birchwood Casey's Aluminium Black works well for this purpose.
Jim