The design on the ring appears to be drawn on the blueprint/map as well. I would have liked to see him show up on Pawn Stars with this. Perhaps the hand is really this: (Treehouse of Horror II)
This is the second time I saw this story posted on a forum today, last was on a metal detecting forum a couple hours ago. I'm guessing they are just props for a play or something.
It's actually a 75% clip of an entire arm. Fortunately, the digits are still visible, which is not always the case with clips.