The Microtech Custom 24K Gold Troy Challenge Coin is a way for you to give a nod to American tradition. Challenge coins were originally given to each member of an Air Force squadron, who would then carry it on them at all times. Challenge coins got their name as a member could challenge another to display their coins at any time. If you didn't have your coin, you owed a round of drinks, but if you had it, the round of drinks are on the challenger. Plated with 24K gold, this coin comes in a clear case so you can display it safely.