Challenge coin navy seal frogman hinged double coinchallenge coin navy seal frogman hinged double coin. The item “Challenge coin navy seal frogman hinged double coin” is in sale since Saturday, May 26, 2018. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “pincointrader2018″ and is located in Fort Mill, South Carolina. This item can be shipped worldwide.