- Prior to 1946, nickels were composed of 75% copper and 25% nickel.
-In 1942, due to the shortage of nickel during World War II, the composition was temporarily changed to 56% copper, 35% silver, and 9% manganese. This composition was used until 1945.
- In 1946, the composition was changed again to 75% copper and 25% nickel, but the silver content was retained as a layer sandwiched between the two metals.
- Finally, in 1971, the United States Mint stopped using silver in the production of nickels altogether, and they have been composed of 75% copper and 25% nickel ever since.
Therefore, nickels minted before 1972 contain a layer of silver, making them unique and potentially more valuable to coin collectors and enthusiasts.