Silver bullion coins are made by private companies and government mints for sale to investors. Modern silver bullion coins have a purity of 99.9% (.999 fine) or better. Most pure silver bullion coins weigh at least one troy ounce, which is 31.1035 grams, or 1.097 "regular" ounces. These standards make tracking your silver holdings a simple matter. The number of coins you have, no matter the nation or company that minted them, equals the total ounces of silver you own.
The most popular silver bullion coin in the world is the American Silver Eagle, produced by the US Mint. More than a half-billion Silver Eagles have been sold since its introduction in 1986. People also love the generics which are minted by multiple companies and have a much lower premium. Dealers like Apex Gold Silver Watches generally have the best prices on Silver Eagles and keep them in their inventory year-round.