Naval Special Warfare Development Group. (AKA – Also Know AS). SEAL Team 6 / Six. Condition: Unused, and in nice good shape. The coin is 1 5/8 inches in diameter with 5 squadron insignia on flip side around in a circle, circa 2014. NOTE: Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless specified above. The free listing tool. The item “Naval Special Warfare Development Group DEVGRU SEAL Team 6 Navy Challenge Coin 4″ is in sale since Friday, September 29, 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.