Before you toss your spare quarters into a vending machine or feed them to a CoinStar, consider this: one specific American ...

The most valuable of those coins — a 1976-S Bicentennial Silver Quarter that came in with a very high grade — sold for $19,200 at auction a few years ago, according to the Chronicle ...

They were notable for being the first U.S. quarters in more than 50 years to feature a special reverse design. The most valuable of those coins — a 1976-S Bicentennial Silver Quarter that came in with ...