Quarters and 20 cent pieces can be a challenge for any collector, especially if you're trying to build a complete set. Between these two types of coins, there is plenty of variety. While the 20 cent piece wasn't used for long, many quarters have been struck over the years. Some of the most collected U.S. quarters are Washington quarters, Standing Liberty quarters, 50 State quarters, and the current America the Beautiful quarters. Like the Standing Liberty quarter, some of the oldest Washington quarters can be quite valuable. If you're a more experienced collector or you are most concerned with high values, then be sure to keep an eye on our classic quarter inventory. You never know when the one you're looking for might show up.