So rare does a coin at this magnitude come along that blows the vast majority away. This 2" coin from the U.S. Navy Center for Tactical Systems Interoperation is simply amazing from design to final product. One side has the diamond swirl edge and other without. A completely 2D design that is just amazing in itself. If you collect U.S. Navy challenge coins then this is an obvious must have. We have 10 to sell and that's it. There is 100 that exist in the world so good luck finding this again!