2017 225th Anniversary Enhanced Uncirculated Set in Original Government Packaging! 10 Coins Inside!. 2017 marks the 225th anniversary of the United States Mint. To celebrate the anniversary, the Mint also released a 225th Anniversary Enhanced Uncirculated set on August 1 that included ten coins with an enhanced uncirculated finish featuring a combination of laser-frosted areas and an unpolished field that accentuates design details. The process creates a unique contrast distinctly different from the mirror-like finish of proof coins. Each coin bears the “S” mint mark of the United States Mint at San Francisco. The coins are the same quarters ( the 8th annual set of American the Beautiful quarter dollars that honor Effigy Mounds National Monument (Iowa), Frederick Douglass National Historic Site (Washington, DC); Ozark National Scenic Riverways (Missouri), Ellis Island (Statue of Liberty National Monument) (New Jersey), and George Rogers Clark National Historical Park (Indiana).), dollar, half dollar, dime, nickel and penny as the other annual sets issued in 2017 but with the special finish and were housed in two lenses, which were then placed in black matte box with a certificate of authenticity. The set was limited to a maximum mintage of 225,000 units. They were the first and only sets of circulation coins struck with an enhanced uncirculated finish.