Naval Special Warfare Group 4 / Four. Condition : Used and in good condition Please see pictures. This coin is 2 x 3 1/4 inches. Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless otherwise specified above. The free listing tool. The item “Naval Special Warfare Group 4 / Four CPO Mess Navy Challenge Coin” is in sale since Friday, April 7, 2017. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.