2019 United States America The Beautiful Quarters Proof Set 5 Coins. This set includes five proof quarters from the America the Beautiful Quarters® Program honoring Lowell National Historical Park in Massachusetts; American Memorial Park in the Northern Mariana Islands; War in the Pacific National Historical Park in Guam; San Antonio Missions National Historical Park in Texas; and Frank Church River of No Return Wilderness in Idaho. This set features all five 2019 America the Beautiful Quarters with proof finishes. United States Mint proof coins feature sharp relief and a mirror-like background. Their sculpted, frosted foregrounds give them a special cameo effect. Proof blanks are specially treated, polished, and cleaned to ensure high-quality strikes. The blanks are then fed into presses fitted with specially polished dies and struck at least twice to ensure sharp relief. The coins are then packaged in a protective lens to showcase and maintain their exceptional finish.