Commander Naval Special Warfare. SEAL Team 17 / Seventeen. Condition: Used, and in good shape. The coin is 2 inches in diameter, with mint mark on edge. 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 “Commander Naval Special Warfare SEAL Team Seventeen / 17 Navy Challenge Coin” is in sale since Monday, September 28, 2020. 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.