I have many of these, some with the original backer, some without. All are new and on the shelf for sale. I purchased these from a retired store owner

The U.S Navy Lieutenant Junior grade Challenge Coin is an original item from the United States, featuring a design specific to the US Navy. The coin is engravable, allowing for customization to personalize the tribute to a Navy Lieutenant junior grade. As a piece of militaria, it is a collectible item that signifies rank and achievement within the Navy. This challenge coin is a symbol of camaraderie and pride for those in the US Navy community.