Collectible coins include various types based on their design, minting location, and year of production. The 1972 dollar coins produced at the Philadelphia Mint are part of the United States coinage system, and they may feature specific designs that represent significant historical events or figures. A "1 Roll" generally refers to a collection of 50 coins, typically encased in a protective wrapper, making it easier for collectors to store and transport them. The condition and rarity of these coins can significantly affect their value in the collectibles market.