United States Naval Special Warfare. Condition: Used, and in good shape. The coin is 1 5/8 inches in diameter. Acquired around a dozen older really nice special warfare challenge coins from a Vietnam era river rat. He said he was able to get most of them from what he call the “Bat Cave” in Coronado. 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 Three or SEAL Team 3 Bronze Navy Challenge Coin” is in sale since Wednesday, November 12, 2014. 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.