The coin in question is a 1875 Twenty Cents piece, produced at the San Francisco Mint, designated with the mint mark 'S'. This silver coin, with a diameter of 22 mm and a weight of 5 grams, represents a denomination of 20 cents in United States currency. The 1875 Twenty Cents coin is notable for its limited mintage, with only 1,155,000 pieces struck, contributing to its value among collectors today. As a part of the sub-type 'Coins' within the larger category of U.S. currency, it reflects both the historical significance of its era and the craftsmanship typical of mint strikes. Due to its silver composition, the coin not only carries numismatic value but is also appreciated for its material quality. While the specified width and height measurements are listed as zero, it typically would boast a round shape common to coinage. Collectors often seek out the 1875 Twenty Cents for its unique attributes and historical context within the evolution of U.S. coinage. Overall, this coin is an intriguing piece of American numismatic history, representing a time when such denominations were actively used and exemplifying the artistry of the San Francisco Mint during the late 19th century.