Look at the second photo. On the ring to the lower left of center, the narrow part of the band has a nub sticking up. This is from where it was cast. This is removed after casting. The idea that these are POW rings is nothing but fantasy. As stated previously, this is a VERY AMATEUR casting project gone terribly wrong. If they WERE buried, it's only because the caster was so ashamed of them, he buried them to hide his hideous creations.