Naval Special Warfare Group 1 Mobile Communications Navy Challenge Coin. This is a challenge coin for the Naval Special Warfare Group Seal Team 1 Mobile Communications Detachment. Coin is in nice shape- please see pictures. Diameter is slightly over 1 7/16 inches, width is 3/16 inches and weighs 42 Grams. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “funnylarri” and is located in this country: US. This item can be shipped to United States.