United States Navy Special Warfare. Condition: Used, and in good shape with surface marks and patina from age. More patina on the SEAL side. The coin is 1 5/8 inches in diameter. To view miscellaneous challenge coins. 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 “Navy Special Warfare SEAL / UDT Navy Challenge Coin b” is in sale since Thursday, September 26, 2013. 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.