United States Navy Naval Special Warfare Unit Two Silver Toned Diamond Cut Edge Navy Challenge Coin. Condition: Used, and in nice shape. The coin is 1 5/8 inches in diameter. 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 Unit Two Silver Toned Diamond Cut Edge Navy Challenge Coin” is in sale since Sunday, February 15, 2015. 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.