In 1976, the US celebrated its 200th birthday with a set of special coins, one of which was the famous Bicentennial Quarter.
The Bicentennial Quarter is very valuable because it is very hard to find. Millions were made to mark the 200th anniversary, but only a few have the special qualities that make them more valuable.
Because they were minted wrong, some Bicentennial Quarters are even more interesting.
The state of a Bicentennial Quarter has a big effect on how much it is worth. At sales and among collectors, coins that are kept in mint or almost mint condition sell for more money.
In the past few years, the market for rare coins, especially the Bicentennial Quarter, has seen prices skyrocket and sales break all records.