Half-Dollars

Half dollar coins are commonly used in casinos; rolls of half dollars are kept on hand in cardrooms in the United States 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 of 50 cents (usually in low-limit seven-card stud and its variants). Many slot machines also took in, and paid out in, 50-cent pieces; however, casinos in recent years have phased in "coinless" slots (for all denominations), taking in paper dollars, and paying winners through vouchers. - Wikipedia.org