Wear a piece of History. https://coinagerings.org/ silver quarters weigh 6.25 grams and are composed of 90% silver, 10% copper, with a total silver weight of 0.1808479 troy ounce pure silver. In lieu of proof sets, specimen sets were specially sold as “Special Mint Sets” minted at the San Francisco mint in 1965, 1966, and 1967 Half Dollar’s are alive. Half dollar coins saw heavy use, particularly in the first half of the twentieth century. For many years, they were commonly used in casinos. Rolls of half dollars may still be kept on hand in cardrooms for games requiring 50-cent antes or bring-in bets, for dealers to pay winning naturals in blackjack, or where the house collects a rake in increments. Additionally, some concession vendors at sporting events distribute half dollar coins as change for convenience.