Naval Special Warfare Group 4. Condition : Used and in good condition. This coin is 2 3/4 x 4 1/2 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 Grp 4 Extra Large Version Chiefs Mess Navy Challenge Coin” is in sale since Saturday, June 25, 2016. 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.