Silver cast bars come in different sizes, usually from oz to 1, oz. Similarly, sovereign mints will often offer special edition coins commemorative coins or minted coins. Given their small size and denominations, silver coins are easy to trade and highly liquid. Imagine you want to sell your one-hundred-ounce medallion—the market for one hundred ounces of silver is much smaller than the market for one ounce of silver. It has been minted since the s and features a modern interpretation of Adolph A.