The 2018 S American Innovation Reverse Proof Dollar NGC PF70 UCAM PR $1 FDOI Patent is a highly sought-after coin featuring the image of a patent on its reverse. This particular coin was minted in San Francisco in 2018 and is a part of the American Innovations series. It is a special edition coin graded as PF70 UCAM, denoting its pristine proof condition. This collectible coin is a valuable addition to any coin enthusiast's collection, showcasing the unique design and craftsmanship of United States coins.