I'm not familiar with NGC or tpg standards, and am interested in an answer to this, too. I have always assumed the tpg guarantee of authenticity, but there are many restrikes of medals and jetons, and am curious how they label them. I also have a question, maybe the medal collectors can answer - How is purity determined? I've seen jetons listed as 2argent, 3argent, and so on... can someone explain the significance of this? I assume this is a reference to silver purity, but am interested in specifics.