Very Shallow Water Mine Countermeasures. Condition: Used, but in good shape. It is 1 1/2 inches in diameter. To view miscellaneous challenge coins. 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 “Very Shallow Water Mine Countermeasures DET EOD Navy Challenge Coin / RECON SEAL” is in sale since Thursday, November 06, 2014. This item is in the category “Collectibles\Militaria\1992-2001\Original Period Items”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.