The story behind the coin
By the mid-1960s the United States had a slow-motion panic on its hands. The price of silver was climbing, and the metal inside a 90% silver quarter was creeping toward — and would soon pass — the 25 cents stamped on its face. When a coin is worth more melted than spent, people stop spending it. Americans began pulling silver dimes, quarters, and half dollars out of circulation by the bagful and stashing them. The country was running short of the coins it needed to make change.
So Congress acted. The Coinage Act of 1965, signed into law by President Lyndon B. Johnson on July 23, 1965, pulled silver out of the dime and the quarter entirely. The Washington quarter — already America's everyday 25-cent piece since 1932 — became a "clad" coin: a pure copper core wrapped in a copper-nickel skin that looks like silver but costs a fraction as much to make. The face of the coin stayed exactly the same. The body underneath was swapped out completely.
This is the quarter in your pocket today, and collectors draw the line right at 1965. Everything from that year forward — the clad Washington quarter — is treated as a distinct type from the 90% silver quarters of 1932–1964 that wear the same George Washington portrait. Same face, different metal, different era.
The Mint was nervous that people would now hoard the new coins, just to keep a souvenir of the changeover. So for three years — coins dated 1965, 1966, and 1967 — it stripped the mint marks off entirely. A mint mark is the little letter that says which factory struck the coin: D for Denver, S for San Francisco, no letter for Philadelphia. The thinking was that featureless coins would seem less worth collecting. The marks returned in 1968 — and this time they moved, from the back of the coin to the front, just to the right of Washington's neck, where they have stayed ever since.
