The first quarters, made in 1796, featured a depiction of Lady Liberty on the obverse and an eagle on the reverse. There was no denomination on the coin. In fact, there was no value marked on quarters until 1804, when "25c" was added to the reverse. In 1838, "QUAR. DOL." was used, and then changed to "quarter dollar" in 1892, and the denomination was consistently located on the reverse of the coin. It wasn't until the first of the new quarters was made in 1999 that "quarter dollar" was moved to the front.
The face of George Washington has appeared on the obverse of the quarter since 1932, the 200th anniversary of his birth. In 1975 and 1976, the standard eagle design on the reverse was temporarily replaced to honor the Nation's Bicentennial of the Declaration of Independence. The reverse of the Bicentennial Quarter shows a colonial drummer and a victory torch circled by 13 stars, representing the original thirteen colonies that were referenced in the Declaration of Independence. Interestingly, it is impossible to tell a quarter minted in 1975 from one minted in 1976; as only Bicentennial Quarters were made for those two years, and all are marked with the same 200-year date range (1776-1976).
Instead of being made of silver, today's quarters are "clad," which means layered. The inner core is pure copper and the outer covering is copper mixed with nickel. You can even see a copper-colored line around the edge.