Silver U.S. coins of all denominations dating from 1964 or earlier are 90% pure silver. Though these coins are thought of as legal tender, the value of their silver content is greater than the face value of the coins. Because they can be purchased with little premium, these coins offer an excellent strategy for people looking to invest in silver. Likewise, if you purchased them when silver was substantially less valuable, you could sell such coins for a profit. In the 1970s, for example, bags of these silver coins were frequently referred to as “junk silver bags,” indicating a bag of everyday circulated silver coins without any rare ones.