You may have had of challenge coins being referred to as commander coins or unit coins. These coins had differing significance to different group of people. They are generally for showing hard work, friendship and to hold memories. There are different challenge coins for each unit of law enforcement out there. This practice of having challenge coins began with the United States Air Force personnel. There were there to show them just how much they valued their input in the world wars. They would hold on to them as a reminder of what they had to do to keep the fight going.
Bronze plating is the choice for these coins. There are some which can be in silver and gold. On the unit, it shall be printed the insignia and motto of the unit. To this day, these coins hold a special part in the hearts and pride of each unit member. When a new member joins their ranks, they get to be presented one as a symbol of acceptance. They can also be given later as a way of boosting their morale. An officer will thus treasure and appreciate their coin.
There are now more people interested in these coins, apart from law enforcement and the military. You will see them being traded at auction houses, online website, and through private individuals. They are all hunting for the rarest, most valuable and unique ones. When you wish to get your hands on one; you need to confirm whether it is genuine, as there are many fake ones in the market. You need to be informed on the exact insignias that should be on a given coin, and see that it is the one printed on a coin you are being sold to. Generally, the older coins going back to the world wars are more valuable. The newer they are, the less value they have attached to them. The next valuable ones are those issued for acts of courage by law enforcement officers. Since they are not many, they shall be more valuable.
As part of the buying process, you need to check of any damage. Buying such a coin comes with some responsibilities. You need to see to it that the coin does not get spoilt or defaced. Those that end up that way lose their value. This rule has affected so many collectors who wanted to wear their coins and so had a small hole drilled on them to add to a chain. Those are now items they cannot sell. You thus need to watch how your coins are handled. Check for any signs of damage before buying any.