Guantanamo Bay Naval Station. Condition : Used and in good condition. This coin is 2 1/2 x 3/4 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 “Guantanamo Bay Naval Station Navy Challenge Coin” is in sale since Sunday, June 18, 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.