NSW Police Force Class Coin Various - MINIMUM ORDER 10 COINS. This product has been created for those wishing to purchase a bulk supply of coins at a reduced price. (especially for those travelling to the United States where challenge coins are very popular). Proud Traditions on the front and on the back of the coin will be the details of the class attestation that we have randomly selected. The coin is enclosed in a hard plastic case. Coin measures 40mm in diameter.