Collectible coins, such as the 1971 Denver Mint quarter, are often sought after by numismatists and collectors due to their historical significance and potential value. The 25-cent quarter, part of the United States Mint's coinage, features designs that reflect American culture and heritage. Coins from the Denver Mint are marked with a "D" mintmark, indicating their origin. Collectors may seek rolls of these quarters to find high-grade specimens, variations, or to complete specific collections.