1. Shield Nickel (1866-1883):
- Composition: 75% copper and 25% nickel
- Silver Content: None
2. Liberty Head Nickel (1883-1913):
- Composition: 75% copper and 25% nickel
- Silver Content: None
3. Buffalo Nickel (1913-1938):
- Composition: 75% copper and 25% nickel
- Silver Content: None
4. Jefferson Nickel (1938-1945):
- Composition: 35% silver, 65% copper
- Silver Content: 35% (during World War II)
5. Jefferson Nickel (1946-1964):
- Composition: 75% copper and 25% nickel
- Silver Content: None
6. Jefferson Nickel (1965-present):
- Composition: 75% copper and 25% nickel
- Silver Content: None
It's worth noting that the nickels produced during World War II had a silver content due to the government's need for silver for wartime purposes. After the war, the composition was changed back to the nickel-copper alloy.